{"id":443,"date":"2026-04-25T09:39:00","date_gmt":"2026-04-25T01:39:00","guid":{"rendered":"https:\/\/larkdrop.cafe\/?p=443"},"modified":"2026-06-22T15:26:15","modified_gmt":"2026-06-22T07:26:15","slug":"sql","status":"publish","type":"post","link":"https:\/\/larkdrop.cafe\/index.php\/2026\/04\/25\/sql\/","title":{"rendered":"SQL"},"content":{"rendered":"\n

\u5f15\u5165<\/h2>\n\n\n\n
\n

\u5982\u679c\u6709\u4e00\u6bb5\u5b66\u751f\u4fe1\u606f\uff0c\u90a3\u4e48\u4f60\u4f1a\u4ea7\u751f\u54ea\u4e9b\u5904\u7406\uff1f<\/p>\n<\/blockquote>\n\n\n\n

\n

\u57fa\u672c\u4e0a\u4f60\u7684\u64cd\u4f5c\u90fd\u662f\u56f4\u7ed5\u7684\u589e\u5220\u6539\u67e5\u6765\u505a\u7684\uff0c\u65b0\u589e\u5b66\u751f\u8bb0\u5f55\uff0c\u5220\u9664\u5b66\u751f\u8bb0\u5f55\uff0c\u4fee\u6539\u5b66\u751f\u8bb0\u5f55\uff0c\u67e5\u8be2\u5b66\u751f\u8bb0\u5f55<\/strong><\/p>\n<\/blockquote>\n\n\n\n

\u90a3\u6211\u4eec\u5148\u6765\u505a\u4e00\u4ef6\u4e8b\u60c5\u597d\u4e86\uff0c\u6211\u4eec\u6709\u4e00\u4e2a\u6587\u672c\u6587\u4ef6(d:\/\/app\/students.txt)\uff0c\u5176\u4e2d\u6709\u4e00\u4e9b\u5b66\u751f\u7684\u4fe1\u606f\uff0c\u5bf9\u5e94\u5982\u4e0b<\/p>\n\n\n\n

\u59d3\u540d,\u5e74\u9f84,\u6027\u522b,\u751f\u65e5,\u90ae\u7bb1,\u7535\u8bdd\n\u5f20\u4e09,20,\u7537,2003-05-12,zhangsan@example.com,123-456-7890\n\u674e\u56db,22,\u5973,2001-07-23,lisi@example.com,123-456-7891\n\u738b\u4e94,21,\u7537,2002-02-17,wangwu@example.com,123-456-7892\n\u8d75\u516d,23,\u5973,2000-11-29,zhaoliu@example.com,123-456-7893\n\u5b59\u4e03,19,\u7537,2004-08-08,sunqi@example.com,123-456-7894\n\u5468\u516b,20,\u5973,2003-01-30,zhouba@example.com,123-456-7895\n\u90d1\u4e5d,21,\u7537,2002-06-15,zhengjiu@example.com,123-456-7896\n\u97e9\u5341,22,\u5973,2001-09-10,hanshi@example.com,123-456-7897<\/code><\/pre>\n\n\n\n
\u5982\u679c\u662f\u4f60\u4e00\u540dJava\u5f00\u53d1\u5de5\u7a0b\u5e08\uff0c\u63a5\u4e0b\u6765\u5982\u4f55\u6765\u8bfb\u53d6\u8fd9\u4e9b\u4fe1\u606f\u5462\uff1f<\/p>\n\n\n\n
\u9996\u5148\u6211\u4eec\u8981\u5148\u660e\u786e\u6bcf\u884c\u4fe1\u606f\uff0c\u4f7f\u7528\u4ec0\u4e48\u6765\u4fdd\u5b58\uff0c\u8fd9\u91cc\u6211\u4eec\u53ef\u4ee5\u5b9a\u4e49\u4e00\u4e2aStudent\u7c7b\uff0c\u6bcf\u4e2aStudent\u7684\u5bf9\u8c61\u5c31\u5bf9\u5e94\u4e86\u4e00\u884c\u5185\u5bb9<\/p>\n\n\n\n
public class Student {\n  private String name;\n  private int age;\n  private String gender;\n  private String birthday;\n  private String email;\n  private String phone;\n  public Student(){\n  }\n  public Student(String name, int age, String gender, String birthday, String email, String phone) {\n    this.name = name;\n    this.age = age;\n    this.gender = gender;\n    this.birthday = birthday;\n    this.email = email;\n    this.phone = phone;\n  }\n\n  @Override\n  public String toString() {\n    return \"Student{\" +\n      \"name='\" + name + '\\'' +\n      \", age=\" + age +\n      \", gender='\" + gender + '\\'' +\n      \", birthday='\" + birthday + '\\'' +\n      \", email='\" + email + '\\'' +\n      \", phone='\" + phone + '\\'' +\n      '}';\n  }\n}<\/code><\/pre>\n\n\n\n
\u90a3\u4e48\u6211\u4eec\u8fd9\u91cc\u7684\u4fe1\u606f\uff0c\u5c31\u53ef\u4ee5\u4f7f\u7528\u4e00\u4e2aList\u6765\u8fdb\u884c\u63a5\u6536\u4e86<\/p>\n\n\n\n
public class StudentLoader {\n  public static void main(String[] args) {\n    String filePath = \"D:\/app\/students.txt\"; \/\/ \u6587\u4ef6\u8def\u5f84\n    \/\/ \u8bfb\u53d6\u6587\u4ef6\u4e2d\u7684\u5185\u5bb9\u4e3aStudent\u4fe1\u606f\n    List<Student> students = loadStudentsFromFile(filePath);\n\n    \/\/ \u8f93\u51fa\u5b66\u751f\u5217\u8868\n    for (Student student : students) {\n      System.out.println(student);\n    }\n  }\n\n  \/**\n     * \u4ece\u6307\u5b9a\u6587\u4ef6\u8def\u5f84\u52a0\u8f7d\u5b66\u751f\u4fe1\u606f\n     * @param filePath \u6587\u4ef6\u8def\u5f84\n     * @return \u5b66\u751f\u4fe1\u606f\u5217\u8868\n     *\/\n  private static List<Student> loadStudentsFromFile(String filePath) {\n    List<Student> students = new ArrayList<>(); \/\/ \u521b\u5efa\u4e00\u4e2a\u7a7a\u7684\u5b66\u751f\u5217\u8868\n    try {\n      BufferedReader br = new BufferedReader(new FileReader(filePath)); \/\/ \u521b\u5efaBufferedReader\u8bfb\u53d6\u6587\u4ef6\n      String line;\n      boolean isFirstLine = true; \/\/ \u6807\u8bb0\u7b2c\u4e00\u884c\u662f\u5426\u5df2\u7ecf\u8bfb\u53d6\n      while ((line = br.readLine()) != null) {\n        if (isFirstLine) {\n          isFirstLine = false; \/\/ \u8df3\u8fc7\u6807\u9898\u884c\n          continue;\n        }\n        \/\/ \u89e3\u6790\u5355\u884c\u6587\u672c\u4e3astudent\u5bf9\u8c61\n        Student lineStudent = parseLineToStudent(line);\n        students.add(lineStudent); \/\/ \u5c06\u89e3\u6790\u540e\u7684\u5b66\u751f\u6dfb\u52a0\u5230\u5217\u8868\u4e2d\n      }\n    } catch (IOException e) {\n      e.printStackTrace(); \/\/ \u6355\u83b7\u5e76\u6253\u5370IO\u5f02\u5e38\n    }\n    return students; \/\/ \u8fd4\u56de\u5b66\u751f\u5217\u8868\n  }\n\n  \/**\n     * \u5c06\u5355\u884c\u5185\u5bb9\u89e3\u6790\u4e3aStudent\u5bf9\u8c61\n     * \u5355\u884c\u5185\u5bb9\u683c\u5f0f\u5982\u4e0b\uff1a\n     * \u5f20\u4e09,20,\u7537,2003-05-12,zhangsan@example.com,123-456-7890\n     * @param line \u5355\u884c\u6587\u672c\n     * @return \u89e3\u6790\u540e\u7684Student\u5bf9\u8c61\n     *\/\n  private static Student parseLineToStudent(String line) {\n    String[] values = line.split(\",\"); \/\/ \u7528\u9017\u53f7\u5206\u9694\u5b57\u7b26\u4e32\n    String name = values[0]; \/\/ \u83b7\u53d6\u59d3\u540d\n    int age = Integer.parseInt(values[1]); \/\/ \u83b7\u53d6\u5e76\u89e3\u6790\u5e74\u9f84\n    String gender = values[2]; \/\/ \u83b7\u53d6\u6027\u522b\n    String birthday = values[3]; \/\/ \u83b7\u53d6\u751f\u65e5\n    String email = values[4]; \/\/ \u83b7\u53d6\u90ae\u7bb1\n    String phone = values[5]; \/\/ \u83b7\u53d6\u7535\u8bdd\n    Student lineStudent = new Student(name, age, gender, birthday, email, phone); \/\/ \u521b\u5efaStudent\u5bf9\u8c61\n    return lineStudent; \/\/ \u8fd4\u56deStudent\u5bf9\u8c61\n  }\n}<\/code><\/pre>\n\n\n\n
\u5728\u4e0a\u8ff0\u7684\u5b66\u751f\u5217\u8868\u4e2d\u627e\u5230\u5e74\u9f84\u226420<\/code>\u7684\u5b66\u751f\u5217\u8868\uff0c\u627e\u5230\u6027\u522b\u4e3a\u7537\u6027<\/code>\u7684\u5b66\u751f\u5217\u8868<\/p>\n\n\n\n
\/\/ \u627e\u5230\u5e74\u9f84\u5c0f\u4e8e\u7b49\u4e8e20\u5c81\u7684\u5b66\u751f\nList<Student> youngStudents = students.stream()\n  .filter(student -> student.getAge() <= 20)\n  .collect(Collectors.toList());\n\/\/ \u627e\u5230\u6027\u522b\u4e3a\u7537\u6027\u7684\u5b66\u751f\nList<Student> maleStudents = students.stream()\n  .filter(student -> \"\u7537\".equals(student.getGender()))\n  .collect(Collectors.toList());<\/code><\/pre>\n\n\n\n
\u5c06\u5b59\u4e03\u7684\u6027\u522b\u4e3a\u5973\uff0c\u5e76\u91cd\u65b0\u4fdd\u5b58\u4fee\u6539\u540e\u7684\u6587\u4ef6<\/p>\n\n\n\n
\/\/ \u4fee\u6539\u5b59\u4e03\u7684\u6027\u522b\u4e3a\u5973\nfor (Student student : students) {\n  if (\"\u5b59\u4e03\".equals(student.getName())) {\n    student.setGender(\"\u5973\");\n    break;\n  }\n}\n\n\/\/ \u5c06\u4fee\u6539\u540e\u7684\u5b66\u751f\u4fe1\u606f\u5199\u56de\u6587\u4ef6\nsaveStudentsToFile(filePath, students);<\/code><\/pre>\n\n\n\n
\/**\n     * \u5c06\u5b66\u751f\u4fe1\u606f\u4fdd\u5b58\u5230\u6307\u5b9a\u6587\u4ef6\u8def\u5f84\n     * @param filePath \u6587\u4ef6\u8def\u5f84\n     * @param students \u5b66\u751f\u4fe1\u606f\u5217\u8868\n     *\/\nprivate static void saveStudentsToFile(String filePath, List<Student> students) {\n  try {\n    BufferedWriter bw = new BufferedWriter(new FileWriter(filePath));\n    \/\/ \u5199\u5165\u6807\u9898\u884c\n    bw.write(\"\u59d3\u540d,\u5e74\u9f84,\u6027\u522b,\u751f\u65e5,\u90ae\u7bb1,\u7535\u8bdd\");\n    bw.newLine();\n    \/\/ \u5199\u5165\u6bcf\u4e2a\u5b66\u751f\u7684\u4fe1\u606f\n    for (Student student : students) {\n      bw.write(student.toCSVString());\n      bw.newLine();\n    }\n    bw.close();\n  } catch (IOException e) {\n    e.printStackTrace(); \/\/ \u6355\u83b7\u5e76\u6253\u5370IO\u5f02\u5e38\n  }\n}<\/code><\/pre>\n\n\n\n
\u5176\u5b9e\u5728\u4e0a\u9762\u7684\u67e5\u8be2\u8fc7\u7a0b\uff0c\u8fd8\u4e0d\u7b97\u5f88\u7e41\u7410\uff0c\u5230\u4fee\u6539\u8fd9\u91cc\u5f00\u59cb\u7e41\u7410\u4e86\uff0c\u4f60\u8981\u628a\u6240\u6709\u7684\u5b66\u751f\u4fe1\u606f\u67e5\u8be2\u51fa\u6765\uff0c\u7136\u540e\u518d\u5176\u4e2d\u627e\u5230\u4f60\u8981\u4fee\u6539\u7684\u8bb0\u5f55if\u5224\u65ad\u901a\u8fc7\u6761\u4ef6<\/strong>\uff0c\u5e76\u4e14\u5728\u4f60\u627e\u5230\u4e4b\u540e\u5bf9\u5168\u90e8\u5185\u5bb9\u91cd\u65b0\u8fdb\u884c\u5199\u51fa\uff0c\u5176\u5b9e\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\u505a\u4e86\u975e\u5e38\u591a\u7684IO\u64cd\u4f5c\uff0c\u8fd9\u4e2a\u662f\u975e\u5e38\u6d88\u8017\u7cfb\u7edf\u8d44\u6e90\u7684<\/p>\n\n\n\n
\u540c\u7406\uff0c\u5220\u9664\u548c\u65b0\u589e\u4e5f\u662f\u5982\u6b64<\/p>\n\n\n\n
\/\/ \u5220\u9664\u5b59\u4e03\u7684\u8bb0\u5f55\nstudents.removeIf(student -> \"\u5b59\u4e03\".equals(student.getName()));\n\n\/\/ \u5c06\u4fee\u6539\u540e\u7684\u5b66\u751f\u4fe1\u606f\u5199\u56de\u6587\u4ef6\nsaveStudentsToFile(filePath, students);<\/code><\/pre>\n\n\n\n
\/\/ \u521b\u5efa\u5218\u4e03\u7684\u8bb0\u5f55\nStudent liuQi = new Student(\"\u5218\u4e03\", 20, \"\u7537\", \"2003-07-07\", \"liuq@example.com\", \"123-456-7899\");\n\n\/\/ \u5728\u8d75\u516d\u548c\u5468\u516b\u4e4b\u95f4\u65b0\u589e\u5218\u4e03\u7684\u8bb0\u5f55\nfor (int i = 0; i < students.size(); i++) {\n  if (\"\u8d75\u516d\".equals(students.get(i).getName()) && i + 1 < students.size() && \"\u5468\u516b\".equals(students.get(i + 1).getName())) {\n    students.add(i + 1, liuQi);\n    break;\n  }\n}\n\n\/\/ \u5c06\u4fee\u6539\u540e\u7684\u5b66\u751f\u4fe1\u606f\u5199\u56de\u6587\u4ef6\nsaveStudentsToFile(filePath, students);<\/code><\/pre>\n\n\n\n
\n
\u5c0f\u7ed3\uff1a<\/p>\n<\/blockquote>\n\n\n\n
\n
\u867d\u7136\u5728\u7b80\u5355\u7684\u5e94\u7528\u4e2d\u4f7f\u7528\u6587\u672c\u6587\u4ef6\u5b58\u50a8\u6570\u636e\u53ef\u80fd\u8db3\u591f\u4e14\u5b9e\u73b0\u7b80\u5355\uff0c\u4f46\u5728\u590d\u6742\u548c\u5927\u89c4\u6a21\u7684\u5e94\u7528\u4e2d\uff0c\u6570\u636e\u5e93\u7cfb\u7edf\u63d0\u4f9b\u7684\u6570\u636e\u5b8c\u6574\u6027\u3001\u5b89\u5168\u6027\u3001\u6548\u7387\u3001\u4fbf\u5229\u6027\u3001\u7ba1\u7406\u6027\u548c\u6269\u5c55\u6027<\/strong>\u662f\u6587\u672c\u6587\u4ef6\u65e0\u6cd5\u6bd4\u62df\u7684\u3002\u56e0\u6b64\uff0c\u6570\u636e\u5e93\u662f\u73b0\u4ee3\u5e94\u7528\u4e2d\u6570\u636e\u7ba1\u7406\u7684\u9996\u9009\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<\/blockquote>\n\n\n\n
\u6570\u636e\u5e93<\/h2>\n\n\n\n
\u4ec0\u4e48\u662f\u6570\u636e\u5e93<\/h3>\n\n\n\n
\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff08DataBase Management System\uff0cDBMS\uff09\u662f\u4e00\u79cd\u64cd\u4f5c\u548c\u7ba1\u7406\u6570\u636e\u5e93\u7684\u5927\u578b\u8f6f\u4ef6\uff0c\u7528\u4e8e\u5efa\u7acb\u3001\u4f7f\u7528\u548c\u7ef4\u62a4\u6570\u636e\u5e93\uff0c\u5b83\u5bf9\u6570\u636e\u5e93\u8fdb\u884c\u7edf\u4e00\u7684\u7ba1\u7406\u548c\u63a7\u5236\uff0c\u4ee5\u4fdd\u8bc1\u6570\u636e\u5e93\u7684\u5b89\u5168\u6027\u548c\u5b8c\u6574\u6027\u3002\u7528\u6237\u901a\u8fc7\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u8bbf\u95ee\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u3002<\/p>\n\n\n\n
\u5728\u73b0\u5b9e\u4e2d\uff0c\u6570\u636e\u3001\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf (DBMS) \u4e00\u8d77\u88ab\u79f0\u4e3a\u6570\u636e\u5e93\u7cfb\u7edf\uff0c\u901a\u5e38\u7b80\u79f0\u4e3a\u6570\u636e\u5e93(DB)\u3002<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u4e3a\u4ec0\u4e48\u4f7f\u7528\u6570\u636e\u5e93<\/h3>\n\n\n\n
\n
1. \u6570\u636e\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027<\/strong><\/p>\n<\/blockquote>\n\n\n\n
\n
\u4e8b\u52a1\u652f\u6301<\/strong>\uff1a\u6570\u636e\u5e93\u7cfb\u7edf\u652f\u6301\u4e8b\u52a1\u5904\u7406\uff0c\u53ef\u4ee5\u786e\u4fdd\u4e00\u7ec4\u64cd\u4f5c\u8981\u4e48\u5168\u90e8\u6210\u529f\uff0c\u8981\u4e48\u5168\u90e8\u5931\u8d25\uff0c\u4fdd\u8bc1\u6570\u636e\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u3002\u4f8b\u5982\uff0c\u5728\u94f6\u884c\u5e94\u7528\u4e2d\uff0c\u8f6c\u8d26\u64cd\u4f5c\u5fc5\u987b\u786e\u4fdd\u4ece\u4e00\u4e2a\u8d26\u6237\u6263\u6b3e\u548c\u5411\u53e6\u4e00\u4e2a\u8d26\u6237\u5b58\u6b3e\u8fd9\u4e24\u4e2a\u64cd\u4f5c\u540c\u65f6\u6210\u529f\u3002<\/p>\n<\/blockquote>\n\n\n\n
\n
\u5e76\u53d1\u63a7\u5236<\/strong>\uff1a\u6570\u636e\u5e93\u63d0\u4f9b\u9501\u673a\u5236\u548c\u5e76\u53d1\u63a7\u5236\uff0c\u9632\u6b62\u591a\u4e2a\u7528\u6237\u540c\u65f6\u8bbf\u95ee\u548c\u4fee\u6539\u6570\u636e\u65f6\u53d1\u751f\u51b2\u7a81\uff0c\u4ece\u800c\u4fdd\u8bc1\u6570\u636e\u7684\u4e00\u81f4\u6027\u3002<\/p>\n<\/blockquote>\n\n\n\n
\n
2. \u6570\u636e\u5b89\u5168<\/strong><\/p>\n<\/blockquote>\n\n\n\n
\n
\u6743\u9650\u63a7\u5236<\/strong>\uff1a\u6570\u636e\u5e93\u7cfb\u7edf\u63d0\u4f9b\u7ec6\u7c92\u5ea6\u7684\u6743\u9650\u63a7\u5236\uff0c\u53ef\u4ee5\u9650\u5236\u4e0d\u540c\u7528\u6237\u5bf9\u6570\u636e\u7684\u8bbf\u95ee\u6743\u9650\uff0c\u786e\u4fdd\u6570\u636e\u7684\u5b89\u5168\u6027\u3002<\/p>\n<\/blockquote>\n\n\n\n
\n
\u5907\u4efd\u4e0e\u6062\u590d<\/strong>\uff1a\u6570\u636e\u5e93\u7cfb\u7edf\u63d0\u4f9b\u6570\u636e\u5907\u4efd\u548c\u6062\u590d\u529f\u80fd\uff0c\u53ef\u4ee5\u5728\u6570\u636e\u4e22\u5931\u6216\u635f\u574f\u65f6\u6062\u590d\u6570\u636e\uff0c\u4fdd\u8bc1\u6570\u636e\u7684\u5b89\u5168\u6027\u548c\u6301\u4e45\u6027\u3002<\/p>\n<\/blockquote>\n\n\n\n
\n
3. \u6570\u636e\u68c0\u7d22\u6548\u7387<\/strong>(\u6700\u540e\u9636\u6bb5)<\/p>\n<\/blockquote>\n\n\n\n
\n
\u7d22\u5f15<\/strong>\uff1a\u6570\u636e\u5e93\u652f\u6301\u7d22\u5f15\uff0c\u53ef\u4ee5\u5927\u5e45\u63d0\u9ad8\u6570\u636e\u68c0\u7d22\u6548\u7387\u3002\u5bf9\u4e8e\u5927\u89c4\u6a21\u6570\u636e\u96c6\uff0c\u901a\u8fc7\u7d22\u5f15\u67e5\u627e\u6570\u636e\u6bd4\u9010\u884c\u626b\u63cf\u6587\u672c\u6587\u4ef6\u8981\u5feb\u5f97\u591a\u3002<\/p>\n<\/blockquote>\n\n\n\n
\n
\u67e5\u8be2\u4f18\u5316<\/strong>\uff1a\u6570\u636e\u5e93\u7cfb\u7edf\u6709\u67e5\u8be2\u4f18\u5316\u5668\uff0c\u53ef\u4ee5\u6839\u636e\u67e5\u8be2\u8bed\u53e5\u7684\u4e0d\u540c\u81ea\u52a8\u9009\u62e9\u6700\u4f18\u7684\u67e5\u8be2\u8def\u5f84\uff0c\u63d0\u9ad8\u6570\u636e\u8bbf\u95ee\u6548\u7387\u3002<\/p>\n<\/blockquote>\n\n\n\n
\n
4. \u6570\u636e\u64cd\u4f5c\u4fbf\u5229<\/strong><\/p>\n<\/blockquote>\n\n\n\n
\n
\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00 (SQL)<\/strong>\uff1a\u6570\u636e\u5e93\u7cfb\u7edf\u652f\u6301SQL\uff0cSQL\u662f\u4e00\u79cd\u5f3a\u5927\u7684\u6570\u636e\u64cd\u4f5c\u8bed\u8a00\uff0c\u53ef\u4ee5\u65b9\u4fbf\u5730\u8fdb\u884c\u6570\u636e\u67e5\u8be2\u3001\u63d2\u5165\u3001\u66f4\u65b0\u548c\u5220\u9664\u7b49\u64cd\u4f5c\u3002<\/p>\n<\/blockquote>\n\n\n\n
\n
\u590d\u6742\u67e5\u8be2<\/strong>\uff1a\u6570\u636e\u5e93\u53ef\u4ee5\u652f\u6301\u590d\u6742\u7684\u67e5\u8be2\u64cd\u4f5c\uff0c\u5982\u591a\u8868\u8fde\u63a5\u3001\u805a\u5408\u51fd\u6570\u3001\u5b50\u67e5\u8be2\u7b49\uff0c\u800c\u5728\u6587\u672c\u6587\u4ef6\u4e2d\u5b9e\u73b0\u8fd9\u4e9b\u64cd\u4f5c\u975e\u5e38\u56f0\u96be\u4e14\u6548\u7387\u4f4e\u4e0b\u3002<\/p>\n<\/blockquote>\n\n\n\n
\n
5. \u6570\u636e\u7ba1\u7406<\/strong><\/p>\n<\/blockquote>\n\n\n\n
\n
\u6570\u636e\u6a21\u578b<\/strong>\uff1a\u6570\u636e\u5e93\u7cfb\u7edf\u652f\u6301\u5173\u7cfb\u578b\u3001\u6587\u6863\u578b\u3001\u56fe\u5f62\u7b49\u591a\u79cd\u6570\u636e\u6a21\u578b\uff0c\u53ef\u4ee5\u6839\u636e\u5e94\u7528\u9700\u6c42\u9009\u62e9\u6700\u5408\u9002\u7684\u6570\u636e\u6a21\u578b\u3002<\/p>\n<\/blockquote>\n\n\n\n
\n
\u6570\u636e\u7ea6\u675f<\/strong>\uff1a\u6570\u636e\u5e93\u652f\u6301\u6570\u636e\u7ea6\u675f\uff0c\u5982\u4e3b\u952e\u3001\u5916\u952e\u3001\u552f\u4e00\u6027\u7ea6\u675f\u7b49\uff0c\u53ef\u4ee5\u4fdd\u8bc1\u6570\u636e\u7684\u5b8c\u6574\u6027\u548c\u6b63\u786e\u6027\u3002<\/p>\n<\/blockquote>\n\n\n\n
\n
\u5b58\u50a8\u4e0e\u68c0\u7d22<\/strong>\uff1a\u6570\u636e\u5e93\u7cfb\u7edf\u63d0\u4f9b\u81ea\u52a8\u7684\u6570\u636e\u5b58\u50a8\u4e0e\u68c0\u7d22\u673a\u5236\uff0c\u4e0d\u9700\u8981\u624b\u52a8\u7ba1\u7406\u6570\u636e\u5b58\u50a8\u6587\u4ef6\u3002<\/p>\n<\/blockquote>\n\n\n\n
\n
6. \u6269\u5c55\u6027<\/strong><\/p>\n<\/blockquote>\n\n\n\n
\n
\u6c34\u5e73\u6269\u5c55<\/strong>\uff1a\u6570\u636e\u5e93\u7cfb\u7edf\u652f\u6301\u96c6\u7fa4\u548c\u5206\u5e03\u5f0f\u5b58\u50a8\uff0c\u53ef\u4ee5\u6c34\u5e73\u6269\u5c55\u5904\u7406\u5927\u89c4\u6a21\u6570\u636e\u548c\u9ad8\u5e76\u53d1\u8bbf\u95ee\u3002<\/p>\n<\/blockquote>\n\n\n\n
\n
\u6027\u80fd\u4f18\u5316<\/strong>\uff1a\u6570\u636e\u5e93\u7cfb\u7edf\u53ef\u4ee5\u901a\u8fc7\u5206\u533a\u3001\u7d22\u5f15\u3001\u7f13\u5b58\u7b49\u591a\u79cd\u6280\u672f\u624b\u6bb5\u4f18\u5316\u6027\u80fd\uff0c\u6ee1\u8db3\u5927\u6570\u636e\u91cf\u548c\u9ad8\u5e76\u53d1\u7684\u5e94\u7528\u9700\u6c42\u3002<\/p>\n<\/blockquote>\n\n\n\n
\u6570\u636e\u5e93\u5206\u7c7b<\/h3>\n\n\n\n
\u5173\u7cfb\u578b\u6570\u636e\u5e93(SQL): \u4e0d\u4ec5\u53ef\u4ee5\u5b58\u50a8\u6570\u636e\uff0c\u8fd8\u53ef\u4ee5\u5b58\u50a8\u6570\u636e\u4e0e\u6570\u636e\u4e4b\u95f4\u7684\u5173\u7cfb\u3002<\/p>\n\n\n\n
\u975e\u5173\u7cfb\u578b\u6570\u636e\u5e93(NoSQL): \u4e0d\u4ec5\u4ec5\u53ea\u6709SQL\u3002\u5bf9\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7684\u8865\u5145\uff0c\u4e3b\u8981\u662f\u7528\u6765\u505a\u4e00\u4e9b\u5173\u7cfb\u578b\u6570\u636e\u5e93\u4e0d\u64c5\u957f\u7684\u4e8b\u60c5\u3002\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7684\u6570\u636e\uff0c\u4e00\u822c\u662f\u5b58\u50a8\u5728\u78c1\u76d8\u4e0a\uff0c\u6240\u4ee5\u901f\u5ea6\u6bd4\u8f83\u6162\u3002\u975e\u5173\u7cfb\u578b\u6570\u636e\u5e93\u4e00\u822c\u662f\u5b58\u5728\u5185\u5b58\u4e2d\u7684\uff0c\u6240\u4ee5\u6027\u80fd\u6bd4\u8f83\u597d\u3002<\/p>\n\n\n\n
\u5e38\u89c1\u6570\u636e\u5e93<\/h3>\n\n\n\n
\u5173\u7cfb\u578b\u6570\u636e\u5e93<\/strong><\/p>\n\n\n\n
\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u4ecb\u7ecd\u51e0\u6b3e\u5e38\u89c1\u7684\u5173\u7cfb\u578b\u6570\u636e\u5e93\u3002<\/p>\n\n\n\n
    \n
  • Oracle\uff1a\u7532\u9aa8\u6587\u516c\u53f8\u7684\u4e00\u4e2a\u4ea7\u54c1\uff0c\u4e16\u754c\u4e0a\u4f7f\u7528\u6700\u591a\u7684\u6536\u8d39\u578b\u6570\u636e\u5e93\u3002\u6027\u80fd\u8f83\u597d\u3002<\/li>\n<\/ul>\n\n\n\n
    \n
    \u53c8\u540dOracle RDBMS(Relational Database Management System)\uff0c\u6216\u7b80\u79f0Oracle\u3002\u662f\u7532\u9aa8\u6587\u516c\u53f8\u7684\u4e00\u6b3e\u5173\u7cfb\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u3002\u5b83\u662f\u5728\u6570\u636e\u5e93\u9886\u57df\u4e00\u76f4\u5904\u4e8e\u9886\u5148\u5730\u4f4d\u7684\u4ea7\u54c1\u3002\u53ef\u4ee5\u8bf4Oracle\u6570\u636e\u5e93\u7cfb\u7edf\u662f\u4e16\u754c\u4e0a\u6d41\u884c\u7684\u5173\u7cfb\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff0c\u7cfb\u7edf\u53ef\u79fb\u690d\u6027\u597d\u3001\u4f7f\u7528\u65b9\u4fbf\u3001\u529f\u80fd\u5f3a\uff0c\u9002\u7528\u4e8e\u5404\u7c7b\u5927\u3001\u4e2d\u3001\u5c0f\u5fae\u673a\u73af\u5883\u3002\u5b83\u662f\u4e00\u79cd\u9ad8\u6548\u7387\u7684\u3001\u53ef\u9760\u6027\u597d\u7684\u3001\u9002\u5e94\u9ad8\u541e\u5410\u91cf\u7684\u6570\u636e\u5e93\u65b9\u6848<\/p>\n<\/blockquote>\n\n\n\n
    \n
    \u4f7f\u7528\u516c\u53f8\uff1a\u5927\u5546\u4e1a\u516c\u53f8\uff0c\u653f\u5e9c\u4f7f\u7528\u8f83\u591a\uff0c\u4f46\u8fd1\u51e0\u5e74\u7531\u4e8e\u4e00\u4e9b\u539f\u56e0\uff0c\u94f6\u884c\uff0c\u653f\u5e9c\u673a\u6784\u7b49\u6b63\u5728\u66ff\u6362Oracle\u3002<\/p>\n<\/blockquote>\n\n\n\n
    MySQL\uff1a\u6700\u6d41\u884c\u7684\u5173\u7cfb\u578b\u6570\u636e\u5e93\uff0c\u4e4b\u524d\u662f\u5f00\u6e90\u7684\u3002<\/p>\n\n\n\n
    \n
    \u7531\u745e\u5178MySQL AB\u516c\u53f8\u5f00\u53d1\uff0c\u76ee\u524d\u5c5e\u4e8eOracle\u65d7\u4e0b\u4ea7\u54c1\u3002MySQL\u662f\u6700\u6d41\u884c\u7684\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u4e4b\u4e00\u3002<\/p>\n<\/blockquote>\n\n\n\n
    \n
    \u76ee\u524d\u5206\u4e3a\u4e24\u79cd\u7248\u672c\uff1a\u793e\u533a\u7248\uff0c\u6536\u8d39\u7248\u3002<\/p>\n<\/blockquote>\n\n\n\n
    \n
    \u6ce8\uff1a2008\u5e74\u88abSun\u516c\u53f8\u6536\u8d2d\u30022009\u5e74\uff0cSun\u516c\u53f8\u88abOracle\u6536\u8d2d\u3002<\/p>\n<\/blockquote>\n\n\n\n
    \n
    \u4f7f\u7528\u516c\u53f8\uff1a\u4e2d\u5c0f\u4f01\u4e1a\uff0c\u8ffd\u6c42\u5feb\u901f\u53d1\u5c55\u3002\u6027\u80fd\u975e\u5e38\u4f18\u79c0\u3002<\/p>\n<\/blockquote>\n\n\n\n
      \n
    • MariaDB\uff1aMySQL\u539f\u4f5c\u8005\u5f00\u53d1\u7684\uff0cMySQL\u88abOracle\u6536\u8d2d\u540e\uff0c\u8003\u8651\u5230Oracle\u53ef\u80fd\u4f1a\u5c06\u5176\u95ed\u6e90\uff0c\u6240\u4ee5\u57fa\u4e8eMySQL\u7684\u4e00\u4e2a\u5206\u652f\uff0c\u53c8\u5f00\u53d1\u4e86\u4e00\u4e2aMariaDB\u3002<\/li>\n<\/ul>\n\n\n\n
      \n
      MariaDB\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u662fMySQL\u7684\u4e00\u4e2a\u5206\u652f\uff0c\u4e3b\u8981\u7531\u5f00\u6e90\u793e\u533a\u5728\u7ef4\u62a4\uff0c\u91c7\u7528GPL\u6388\u6743\u8bb8\u53ef MariaDB\u7684\u76ee\u7684\u662f\u5b8c\u5168\u517c\u5bb9MySQL\uff0c\u5305\u62ecAPI\u548c\u547d\u4ee4\u884c\uff0c\u4f7f\u4e4b\u80fd\u8f7b\u677e\u6210\u4e3aMySQL\u7684\u4ee3\u66ff\u54c1\u3002MariaDB\u540d\u79f0\u6765\u81eaMichael Widenius\u7684\u5973\u513fMaria\u7684\u540d\u5b57\u3002<\/p>\n<\/blockquote>\n\n\n\n
      \n
      \u4f7f\u7528\u516c\u53f8\uff1a\u4e2d\u5c0f\u4f01\u4e1a\uff0c\u8ffd\u6c42\u5feb\u901f\u53d1\u5c55\u3002MySQL\u4f5c\u8005\u7684\u7c89\u4e1d\u3002MaxDB<\/p>\n<\/blockquote>\n\n\n\n
        \n
      • Sql server\uff1a\u5fae\u8f6f\u5f00\u53d1\u7684\u3002<\/li>\n<\/ul>\n\n\n\n
        \n
        SQL Server\u662f\u7531\u5fae\u8f6f\u516c\u53f8\u5f00\u53d1\u7684\u4e00\u79cd\u5173\u7cfb\u578b\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff0c\u5b83\u5df2\u5e7f\u6cdb\u7528\u4e8e\u7535\u5b50\u5546\u52a1\u3001\u94f6\u884c\u3001\u4fdd\u9669\u3001\u7535\u529b\u7b49\u884c\u4e1a\u3002SQLServer\u63d0\u4f9b\u4e86\u5bf9XML\u548cInternet\u6807\u51c6\u7684\u652f\u6301\uff0c\u5177\u6709\u5f3a\u5927\u7684\u3001\u7075\u6d3b\u7684\u3001\u57fa\u4e8eWeb\u7684\u5e94\u7528\u7a0b\u5e8f\u7ba1\u7406\u529f\u80fd\u3002\u800c\u4e14\u754c\u9762\u53cb\u597d\u3001\u6613\u4e8e\u64cd\u4f5c\uff0c\u6df1\u53d7\u5e7f\u5927\u7528\u6237\u7684\u559c\u7231\uff0c\u4f46\u5b83\u53ea\u80fd\u5728Windows\u5e73\u53f0\u4e0a\u8fd0\u884c(2017 SQL Server\u540e\u5bf9Linux\u652f\u6301)\uff0c\u5e76\u5bf9\u64cd\u4f5c\u7cfb\u7edf\u7684\u7a33\u5b9a\u6027\u8981\u6c42\u8f83\u9ad8\uff0c\u56e0\u6b64\u5f88\u96be\u5904\u7406\u65e5\u76ca\u589e\u957f\u7684\u7528\u6237\u6570\u91cf\u3002<\/p>\n<\/blockquote>\n\n\n\n
        \n
        \u4f7f\u7528\u516c\u53f8\uff1a\u4e2d\u5927\u578b\u4f01\u4e1a\u3002\u56fd\u5185\u7528\u7684\u4e0d\u591a\u3002<\/p>\n<\/blockquote>\n\n\n\n
          \n
        • DB2\u6570\u636e\u5e93<\/li>\n<\/ul>\n\n\n\n
          \n
          DB2\u6570\u636e\u5e93\u662f\u7531IBM\u516c\u53f8\u7814\u5236\u7684\u4e00\u79cd\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff0c\u4e3b\u8981\u5e94\u7528\u4e8eOS\/2\u3001Windows\u7b49\u5e73\u53f0\u4e0b\uff0c\u5177\u6709\u8f83\u597d\u7684\u53ef\u4f38\u7f29\u6027\uff0c\u53ef\u652f\u6301\u4ece\u5927\u578b\u8ba1\u7b97\u673a\u5230\u5355\u7528\u6237\u73af\u5883\u3002<\/p>\n<\/blockquote>\n\n\n\n
          \n
          DB2\u652f\u6301\u6807\u51c6\u7684SQL\uff0c\u5e76\u4e14\u63d0\u4f9b\u4e86\u9ad8\u5c42\u6b21\u7684\u6570\u636e\u5229\u7528\u6027\u3001\u5b8c\u6574\u6027\u3001\u5b89\u5168\u6027\u548c\u53ef\u6062\u590d\u6027\uff0c\u4ee5\u53ca\u4ece\u5c0f\u89c4\u6a21\u5230\u5927\u89c4\u6a21\u5e94\u7528\u7a0b\u5e8f\u7684\u6267\u884c\u80fd\u529b\uff0c\u9002\u5408\u4e8e\u6d77\u91cf\u6570\u636e\u7684\u5b58\u50a8\uff0c\u4f46\u76f8\u5bf9\u4e8e\u5176\u4ed6\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u800c\u8a00\uff0cDB2\u7684\u64cd\u4f5c\u6bd4\u8f83\u590d\u6742\u3002<\/p>\n<\/blockquote>\n\n\n\n
          \n
          \u4f7f\u7528\u516c\u53f8\uff1a\u5927\u516c\u53f8\uff0c\u653f\u5e9c\u90e8\u95e8<\/p>\n<\/blockquote>\n\n\n\n
            \n
          • PostgreSQL<\/li>\n<\/ul>\n\n\n\n
            \n
            \u662f\u4ee5\u52a0\u5dde\u5927\u5b66\u4f2f\u514b\u5229\u5206\u6821\u8ba1\u7b97\u673a\u7cfb\u5f00\u53d1\u7684 Postgres \u7248\u672c 4.2 \u4e3a\u57fa\u7840\u7684\u5bf9\u8c61\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff08ORDBMS\uff09\u3002<\/p>\n<\/blockquote>\n\n\n\n
            \n
            \u56e0\u4e3a\u8bb8\u53ef\u8bc1\u7684\u7075\u6d3b\uff0c\u4efb\u4f55\u4eba\u90fd\u53ef\u4ee5\u4ee5\u4efb\u4f55\u76ee\u7684\u514d\u8d39\u4f7f\u7528\u3001\u4fee\u6539\u548c\u5206\u53d1PostgreSQL\u3002<\/p>\n<\/blockquote>\n\n\n\n
            \n
            \u4f7f\u7528\u516c\u53f8\uff1a\u6709\u81ea\u7814\u80fd\u529b\u7684\u516c\u53f8\u4f7f\u7528\u8f83\u591a\u3002\u4f8b\u5982\u56fd\u5185\u7684\u534e\u4e3a\u3002<\/p>\n<\/blockquote>\n\n\n\n
            \u975e\u5173\u7cfb\u578b\u6570\u636e\u5e93<\/strong><\/p>\n\n\n\n
            \u5e38\u89c1\u7684\u975e\u5173\u7cfb\u578b\u6570\u636e\u5e93<\/p>\n\n\n\n
              \n
            • Redis\uff1a \u6700\u5e38\u7528\u7684\u975e\u5173\u7cfb\u578b\u6570\u636e\u5e93\uff0c\u6570\u636e\u5b58\u5728\u5185\u5b58\uff0c\u901f\u5ea6\u5feb\uff0c\u541e\u5410\u91cf\u9ad8\u3002\u5355\u673a10w\u541e\u5410\u3002<\/li>\n<\/ul>\n\n\n\n
              \n
              Remote Dictionary Server(Redis) \u662f\u4e00\u4e2a\u7531 Salvatore Sanfilippo \u5199\u7684 key-value \u5b58\u50a8\u7cfb\u7edf\uff0c\u662f\u8de8\u5e73\u53f0\u7684\u975e\u5173\u7cfb\u578b\u6570\u636e\u5e93\u3002 Redis \u662f\u4e00\u4e2a\u5f00\u6e90\u7684\u4f7f\u7528 ANSI C \u8bed\u8a00\u7f16\u5199\u3001\u9075\u5b88 BSD \u534f\u8bae\u3001\u652f\u6301\u7f51\u7edc\u3001\u53ef\u57fa\u4e8e\u5185\u5b58\u3001\u5206\u5e03\u5f0f\u3001\u53ef\u9009\u6301\u4e45\u6027\u7684\u952e\u503c\u5bf9(Key-Value)\u5b58\u50a8\u6570\u636e\u5e93\uff0c\u5e76\u63d0\u4f9b\u591a\u79cd\u8bed\u8a00\u7684 API\u3002\u5b83\u662f\u4e00\u4e2a\u57fa\u4e8e\u5185\u5b58\u5b9e\u73b0\u7684\u952e\u503c\u578b\u975e\u5173\u7cfb\uff08NoSQL\uff09\u6570\u636e\u5e93<\/p>\n<\/blockquote>\n\n\n\n
              \n
              Redis \u9075\u5b88 BSD \u534f\u8bae\uff0c\u5b9e\u73b0\u4e86\u514d\u8d39\u5f00\u6e90\uff0c\u5176\u6700\u65b0\u7248\u672c\u662f 6.20\uff0c\u5e38\u7528\u7248\u672c\u5305\u62ec 3.0 \u30014.0\u30015.0\u3002\u81ea Redis \u8bde\u751f\u4ee5\u6765\uff0c\u5b83\u4ee5\u5176\u8d85\u9ad8\u7684\u6027\u80fd\u3001\u5b8c\u7f8e\u7684\u6587\u6863\u548c\u7b80\u6d01\u6613\u61c2\u7684\u6e90\u7801\u5e7f\u53d7\u597d\u8bc4\uff0c\u56fd\u5185\u5916\u5f88\u591a\u5927\u578b\u4e92\u8054\u7f51\u516c\u53f8\u90fd\u5728\u4f7f\u7528 Redis\uff0c\u6bd4\u5982\u817e\u8baf\u3001\u963f\u91cc\u3001Twitter\u3001Github \u7b49\u7b49\u3002<\/p>\n<\/blockquote>\n\n\n\n
              \n
              redisCli.put(“name”, “zhangsan”);<\/p>\n<\/blockquote>\n\n\n\n
              \n
              redisCli.get(“name”);<\/p>\n<\/blockquote>\n\n\n\n
                \n
              • Memcached<\/li>\n<\/ul>\n\n\n\n
                \n
                \u57fa\u4e8e\u5185\u5b58\u7684key-value\u6570\u636e\u5e93\u3002\u51fa\u73b0\u81eaRedis\u4e4b\u524d\uff0c\u4f46\u6709\u4e00\u4e9b\u95ee\u9898\u3002<\/p>\n<\/blockquote>\n\n\n\n
                \n
                – \u6570\u636e\u5168\u90e8\u5728\u5185\u5b58\u4e2d\uff0c\u65ad\u7535\u540e\u4f1a\u6302\u6389\uff0c\u6570\u636e\u4e0d\u80fd\u8d85\u8fc7\u5185\u5b58\u5927\u5c0f<\/p>\n<\/blockquote>\n\n\n\n
                \n
                – \u652f\u6301\u7684\u7c7b\u578b\u4e0d\u4e30\u5bcc<\/p>\n<\/blockquote>\n\n\n\n
                \n
                \u6240\u4ee5\u76ee\u524d\u516c\u53f8\u4f7f\u7528\u5b83\u7684\u8f83\u5c11\uff0c\u4e00\u4e9b\u8001\u9879\u76ee\u53ef\u80fd\u4ecd\u7136\u5728\u4f7f\u7528\uff0c\u65b0\u9879\u76ee\u65e0\u4f7f\u7528\u5b83\u7684\u3002<\/p>\n<\/blockquote>\n\n\n\n
                  \n
                • Mongodb\uff1a\u6587\u6863\u6570\u636e\u5e93\u3002\u5b58\u50a8\u5927\u91cf\u6587\u6863\u7684\u3002<\/li>\n\n\n\n
                • Hbase\uff1a\u5927\u6570\u636e\u9886\u57df\u4f7f\u7528\u7684\u6bd4\u8f83\u591a\u7684\u6570\u636e\u5e93\uff0c\u5217\u5f0f\u6570\u636e\u5e93\u3002<\/li>\n<\/ul>\n\n\n\n
                  \u5c0f\u7ed3<\/strong><\/p>\n\n\n\n
                  \u6570\u636e\u5e93\u6709\u5f88\u591a\u79cd\uff0c\u8fd9\u65e0\u5173\u5b70\u4f18\u5b70\u52a3(\u6ca1\u6709\u8c01\u597d\u8c01\u5dee\u4e4b\u5206)\uff0c\u4e3b\u8981\u53d6\u51b3\u4e8e\u4f01\u4e1a\u5e0c\u671b\u5982\u4f55\u4f7f\u7528\u6570\u636e.<\/p>\n\n\n\n
                  \u4f01\u4e1a\u8981\u6c42\uff1a \u94b1\u5c11\uff0c\u80fd\u7528\u3002\u6027\u80fd\u5dee\u4e0d\u591a\u5c31\u53ef\u4ee5\u3002 MySQL<\/p>\n\n\n\n
                  \u653f\u5e9c\u8981\u6c42\uff1a \u94b1\u65e0\u6240\u8c13\uff0c\u5343\u4e07\u6570\u636e\u8981\u5b89\u5168\u3002<\/p>\n\n\n\n
                  \n
                  \u5173\u7cfb\u578b\u6570\u636e\u5e93\u548c\u975e\u5173\u7cfb\u578b\u6570\u636e\u5e93, \u533a\u522b\u5f88\u591a.<\/p>\n<\/blockquote>\n\n\n\n
                  \n
                  \u800c\u5728\u5173\u7cfb\u578b\u548c\u975e\u5173\u7cfb\u578b\u6570\u636e\u4e2d,\u6700\u672c\u8d28\u7684\u533a\u522b\u662f: \u5173\u7cfb\u578b\u6570\u636e\u5e93\u4ee5\u6570\u636e\u548c\u6570\u636e\u4e4b\u95f4\u5b58\u5728\u7684\u5173\u7cfb<\/code>\u7ef4\u62a4\u6570\u636e, \u800c\u975e\u5173\u7cfb\u578b\u6570\u636e\u5e93\u662f\u6307\u5b58\u50a8\u6570\u636e\u7684\u65f6\u5019\u6570\u636e\u548c\u6570\u636e\u4e4b\u95f4\u6ca1\u6709\u4ec0\u4e48\u7279\u5b9a\u5173\u7cfb<\/code>.<\/p>\n<\/blockquote>\n\n\n\n
                  \n
                  \u5728\u5927\u591a\u6570\u65f6\u5019, \u975e\u5173\u7cfb\u578b\u6570\u636e\u5e93\u662f\u5728\u4f20\u7edf\u5173\u7cfb\u578b\u6570\u636e\u5e93\u57fa\u7840\u4e0a(\u5176\u5b9e\u5df2\u7ecf\u57fa\u672c\u4e0a\u5b8c\u5168\u4e0d\u540c), \u5728\u529f\u80fd\u4e0a\u7b80\u5316, \u5728\u6570\u636e\u5b58\u50a8\u7ed3\u6784\u4e0a\u5927\u5927\u6539\u53d8, \u5728\u6548\u7387\u4e0a\u63d0\u5347. \u901a\u8fc7\u51cf\u5c11\u7528\u4e0d\u5230\u6216\u5f88\u5c11\u7528\u7684\u529f\u80fd, \u5728\u80fd\u529b\u5f31\u5316\u7684\u540c\u65f6\u4e5f\u5e26\u6765\u4ea7\u54c1\u6027\u80fd\u7684\u5927\u5e45\u5ea6\u63d0\u9ad8.<\/p>\n<\/blockquote>\n\n\n\n
                  \n
                  \u4f46\u662f\u672c\u8d28\u4e0a\u8bb2, \u4ed6\u4eec\u90fd\u662f\u7528\u6765\u5b58\u50a8\u6570\u636e\u7684. \u800c\u5bf9\u4e8e\u6211\u4eecJava\u540e\u7aef\u5f00\u53d1\u6765\u8bb2,\u6211\u4eec\u5728\u5de5\u4f5c\u4e2d\u57fa\u672c\u4e0a\u662f\u4ee5\u5173\u7cfb\u578b\u6570\u636e\u5e93\u4e3a\u4e3b, \u975e\u5173\u7cfb\u578b\u6570\u636e\u5e93\u4e3a\u8f85\u7684\u7528\u6cd5<\/p>\n<\/blockquote>\n\n\n\n
                  MySQL\u5185\u90e8\u6570\u636e\u7ec4\u7ec7\u65b9\u5f0f<\/h3>\n\n\n\n
                  \u5728MySQL\u4e2d, \u6211\u4eec\u5bf9\u6570\u636e\u7684\u7ec4\u7ec7\u903b\u8f91\u4e0a\u662f\u6309\u7167\u5e93\/\u8868\/\u6570\u636e \u8fd9\u79cd\u7ed3\u6784\u7ec4\u7ec7\u7684.<\/p>\n\n\n\n
                  \u6570\u636e\u5e93(Database)<\/strong>: \u8868\u793a\u4e00\u4efd\u5b8c\u6574\u7684\u6570\u636e\u4ed3\u5e93, \u5728\u8fd9\u4e2a\u6570\u636e\u4ed3\u5e93\u4e2d\u5206\u4e3a\u591a\u5f20\u4e0d\u540c\u7684\u8868.<\/p>\n\n\n\n
                  \u8868(Table)<\/strong>: \u8868\u793a\u67d0\u79cd\u7279\u5b9a\u7c7b\u578b\u6570\u636e\u7684\u7684\u7ed3\u6784\u5316\u6e05\u5355, \u91cc\u9762\u5305\u542b\u591a\u6761\u6570\u636e.<\/p>\n\n\n\n
                  \u6570\u636e(Data)<\/strong>: \u8868\u4e2d\u6570\u636e\u7684\u57fa\u672c\u5355\u5143.<\/p>\n\n\n\n
                  \"\"<\/div><\/figure>\n\n\n\n
                  SQL<\/h2>\n\n\n\n
                  SQL\u6709\u5982\u4e0b\u4f18\u70b9<\/p>\n\n\n\n
                  \n
                  SQL\u8bed\u8a00\u4e0d\u662f\u67d0\u4e2a\u7279\u5b9a\u7684\u6570\u636e\u5e93\u63d0\u4f9b\u7684\u8bed\u8a00, \u5b83\u662f\u4e00\u79cd\u6570\u636e\u5e93\u6807\u51c6\u8bed\u8a00(\u6700\u521d\u7531\u7f8e\u56fd\u56fd\u5bb6\u6807\u51c6\u5c40 ANSI\u4e8e1986\u5e74\u5b8c\u6210\u7b2c\u4e00\u7248SQL\u6807\u51c6\u7684\u5b9a\u4e49,\u5373SQL-86)\u3002\u8fd9\u4e5f\u5c31\u610f\u5473\u7740\u6bcf\u4e2a\u5173\u7cfb\u578b\u6570\u636e\u5e93\u90fd\u652f\u6301SQL\u8bed\u8a00.<\/p>\n<\/blockquote>\n\n\n\n
                  \n
                  SQL\u7b80\u5355\u6613\u5b66, \u662f\u7531\u591a\u4e2a\u63cf\u8ff0\u6027\u5f88\u5f3a\u7684\u5355\u8bcd\u6784\u6210, \u5e76\u4e14\u8fd9\u4e9b\u5355\u8bcd\u6570\u91cf\u4e0d\u591a\u3002<\/p>\n<\/blockquote>\n\n\n\n
                  \n
                  SQL\u5c3d\u7ba1\u770b\u4e0a\u53bb\u5f88\u7b80\u5355, \u4f46\u662f\u975e\u5e38\u5f3a\u6709\u529b; \u7075\u6d3b\u7684\u4f7f\u7528SQL, \u53ef\u4ee5\u8fdb\u884c\u6bd4\u8f83\u590d\u6742\u7684\u548c\u9ad8\u7ea7\u7684\u6570\u636e\u5e93\u64cd\u4f5c\u3002<\/p>\n<\/blockquote>\n\n\n\n
                  \u540e\u7eed\u4f7f\u7528\u7684\u6307\u4ee4\u51fa\u73b0\u6807\u70b9\u7b26\u53f7\u7684\u5730\u65b9\u5747\u4f7f\u7528\u82f1\u6587\u6807\u70b9\uff01\u6bcf\u4e2aSQL\u8bed\u53e5\u540e\u9762\u90fd\u8981\u6709\u5206\u53f7<\/strong><\/p>\n\n\n\n
                  \u6570\u636e\u5e93\u7ba1\u7406\u5de5\u5177<\/h3>\n\n\n\n
                  \u6570\u636e\u5e93\u7ba1\u7406\u5de5\u5177\u662f\u7528\u4e8e\u521b\u5efa\u3001\u7ba1\u7406\u3001\u7ef4\u62a4\u548c\u4f18\u5316\u6570\u636e\u5e93\u7cfb\u7edf\u7684\u8f6f\u4ef6\u5e94\u7528\u7a0b\u5e8f\u3002\u8fd9\u4e9b\u5de5\u5177\u901a\u5e38\u63d0\u4f9b\u76f4\u89c2\u7684\u7528\u6237\u754c\u9762\uff0c\u4f7f\u6570\u636e\u5e93\u7ba1\u7406\u5458\u548c\u5f00\u53d1\u4eba\u5458\u80fd\u591f\u8f7b\u677e\u5730\u6267\u884c\u5404\u79cd\u6570\u636e\u5e93\u4efb\u52a1\u3002<\/p>\n\n\n\n
                  MySQL Workbench\u3001SQLyog\u3001Navicat\u3001DataGrip<\/p>\n\n\n\n
                  SQL\u57fa\u672c\u64cd\u4f5c<\/h3>\n\n\n\n
                  \u6570\u636e\u5e93\u5185\u90e8\u6570\u636e\u7684\u7ec4\u7ec7\u903b\u8f91\u4e0a\u662f\u6309\u7167\u5e93\/\u8868\/\u6570\u636e<\/code> \u8fd9\u79cd\u7ed3\u6784\u7ec4\u7ec7\u7684\uff0c\u63a5\u4e0b\u6765\u5bf9\u4e8eSQL\u57fa\u672c\u64cd\u4f5c\u7684\u4ecb\u7ecd\u4e5f\u662f\u6309\u7167\u8fd9\u4e2a\u987a\u5e8f\u8fdb\u884c\uff0c\u7531\u5916\u5411\u5185\u5206\u522b\u4e3a<\/p>\n\n\n\n
                    \n
                  1. \u6570\u636e\u5e93(Database)<\/li>\n\n\n\n
                  2. \u8868(Table)<\/li>\n\n\n\n
                  3. \u6570\u636e(Data)<\/li>\n<\/ol>\n\n\n\n
                    \u767b\u5f55\u6570\u636e\u5e93<\/h3>\n\n\n\n
                    \n
                    MySQL\u662fC\/S\u67b6\u6784\u7684\u8f6f\u4ef6\uff0c\u6240\u4ee5\u6211\u4eec\u7684Server\u662f\u4e00\u76f4\u542f\u52a8\u7740\u7684\uff0c\u6211\u4eec\u4f7f\u7528\u5b98\u65b9\u63d0\u4f9b\u7684\u5ba2\u6237\u7aef\u53bb\u8fde\u63a5Server\uff0c\u7136\u540e\u53d1\u9001\u547d\u4ee4\u7ed9server\u7aef\u6267\u884c\uff0cserver\u7aef\u8fd4\u56de\u6267\u884c\u7ed3\u679c\u3002<\/p>\n<\/blockquote>\n\n\n\n
                    \"\"<\/div><\/figure>\n\n\n\n
                    \u5728\u914d\u7f6e\u597d\u73af\u5883\u53d8\u91cf\u4e4b\u540e\uff0c\u53ef\u4ee5\u901a\u8fc7\u547d\u4ee4\u6765\u767b\u5f55MySQL<\/p>\n\n\n\n
                    mysql -u[\u7528\u6237\u540d] -p\nmysql -u[\u7528\u6237\u540d] -p[\u5bc6\u7801]<\/code><\/pre>\n\n\n\n
                    \n
                    \u524d\u8005\u662f\u6267\u884c\u6307\u4ee4\u4e4b\u540e\u8f93\u5165\u5bc6\u7801\uff0c\u540e\u8005\u662f\u5c06\u5bc6\u7801\u76f4\u63a5\u5728\u6307\u4ee4\u4e0a\u660e\u6587\u8f93\u5165\u3002\u4e0d\u5efa\u8bae\u5927\u5bb6\u76f4\u63a5\u5c06\u5bc6\u7801\u5199\u5728\u63a7\u5236\u53f0\u4e0a\uff0c\u8fd9\u6837\u5b50\u4e0d\u5b89\u5168\u3002\uff08\u5176\u5b9e\u6ca1\u5565\u5173\u7cfb\uff09<\/p>\n<\/blockquote>\n\n\n\n
                    \u64cd\u4f5c\u6570\u636e\u5e93<\/h3>\n\n\n\n
                    MySQL\u9ed8\u8ba4\u81ea\u5e26\u7684\u5e93(mysql<\/code> \u3001performance_schema<\/code> \u3001information_schema<\/code>\u3001sys<\/code>)\uff0c\u4e0d\u8981\u53bb\u5220\u9664\u5b83\u4eec\u3002<\/p>\n\n\n\n
                    \u6ce8\u610f \u5e93\u540d\uff0c\u8868\u540d\uff0c\u5217\u540d\u5747\u4e0d\u533a\u5206\u5927\u5c0f\u5199\uff08\u8fd9\u4e2a\u662fMySQL\u7684\u9ed8\u8ba4\u914d\u7f6e\uff09\u3002<\/p>\n\n\n\n
                    \u67e5\u770b\u6570\u636e\u5e93<\/strong><\/p>\n\n\n\n
                    —<\/p>\n\n\n\n
                    -- \u67e5\u770b\u6240\u6709\u7684\u6570\u636e\u5e93\nshow databases;<\/code><\/pre>\n\n\n\n
                    —<\/p>\n\n\n\n
                    show databases like 'alpha%'; -- \u4ee5alpha\u5f00\u5934 \nshow databases like '%beta';  -- \u4ee5beta\u7ed3\u5c3e\nshow databases like '%gamma%' -- gamma\u51fa\u73b0\u5728\u4efb\u4f55\u4f4d\u7f6e\n-- \u5176\u4e2d\u5355\u5f15\u53f7''\u4e5f\u53ef\u4ee5\u66ff\u6362\u4e3a\u53cc\u5f15\u53f7\"\"\uff0c\u4f46\u662f\u6ce8\u610f\u4f7f\u7528\u82f1\u6587<\/code><\/pre>\n\n\n\n
                    —<\/p>\n\n\n\n
                    -- \u67e5\u770b\u521b\u5efa\u6570\u636e\u5e93\u547d\u4ee4\uff08\u6307\u5b9a\u7684\u6570\u636e\u5e93\u4f7f\u7528\u4ec0\u4e48SQL\u8bed\u53e5\u521b\u5efa\u51fa\u6765\u7684\uff09\nshow create database <\u6570\u636e\u5e93\u540d\u79f0>;<\/code><\/pre>\n\n\n\n
                    \u521b\u5efa\u6570\u636e\u5e93<\/strong><\/p>\n\n\n\n
                    -- \u521b\u5efa\u6570\u636e\u5e93(\u540d\u79f0\u4e0d\u533a\u5206\u5927\u5c0f\u5199)\ncreate database <\u6570\u636e\u5e93\u540d\u79f0>;\n-- \u5982\u679c\u662f\u590d\u5408\u8bcd\u540d\u79f0\uff0c\u4f7f\u7528\u4e0b\u5212\u7ebf\u547d\u540d\u6cd5<\/code><\/pre>\n\n\n\n
                    —<\/p>\n\n\n\n
                    -- \u521b\u5efa\u6570\u636e\u5e93\uff0c\u6307\u5b9a\u5b57\u7b26\u96c6\u548c\u9ed8\u8ba4\u6821\u5bf9\u89c4\u5219\ncreate database <\u6570\u636e\u5e93\u540d\u79f0> character set <\u5b57\u7b26\u96c6> collate <\u6821\u5bf9\u89c4\u5219>;\n-- \u6bd4\u5982\u521b\u5efa\u4e00\u4e2a\u6570\u636e\u5e93student_info\uff0c\u5b57\u7b26\u96c6\u662f  utf8mb4  \u6821\u5bf9\u89c4\u5219  utf8mb4_general_ci\ncreate database student_info character set utf8mb4 collate utf8mb4_general_ci;<\/code><\/pre>\n\n\n\n
                    —<\/p>\n\n\n\n
                    Navicat\u4e2d\u53ef\u4ee5\u4f7f\u7528\u56fe\u5f62\u5316\u754c\u9762\u76f4\u63a5\u65b0\u5efa\u6570\u636e\u5e93<\/p>\n\n\n\n
                    \u5176\u5b9e\u672c\u8d28\u4e0a\u662f\u4e00\u6837\u7684\uff0c\u53ef\u4ee5\u70b9\u51fb\u90a3\u91cc\u7684SQL\u9884\u89c8<\/code>\uff0c\u672c\u8d28\u4e0a\u56fe\u5f62\u5316\u9875\u9762\u662f\u5e2e\u4f60\u6267\u884c\u4e86\u5bf9\u5e94\u7684SQL\u8bed\u53e5\u3002<\/p>\n\n\n\n
                    —<\/p>\n\n\n\n
                    \u6ce8\u610f\uff1a\u5173\u952e\u8bcd\u4f5c\u4e3a\u53c2\u6570\u65f6\u4f7f\u7528“<\/p>\n\n\n\n
                    \u4e0a\u9762\u6700\u5f00\u59cb\u6ca1\u6709\u4f7f\u7528\u98d8\u53f7(“)\u65f6\uff0c\u62a5\u95191064,\u5b58\u5728SQL\u8bed\u6cd5\u9519\u8bef\uff0c\u4f7f\u7528\u540e\u5219\u53ef\u4ee5\u6b63\u5e38\u6267\u884c\uff0c\u521b\u5efa\u540d\u79f0\u4e3ashow\u7684\u6570\u636e\u5e93\u3002<\/p>\n\n\n\n
                    \u963f\u91cc\u7f16\u7a0b\u89c4\u8303<\/p>\n\n\n\n
                    \"\"<\/div><\/figure>\n\n\n\n
                    \n
                    MySQL \u7684\u5b57\u7b26\u96c6\uff08CHARACTER\uff09\u548c\u6821\u5bf9\u89c4\u5219\uff08COLLATION\uff09\u662f\u4e24\u4e2a\u4e0d\u540c\u7684\u6982\u5ff5\u3002\u5b57\u7b26\u96c6\u662f\u7528\u6765\u5b9a\u4e49 MySQL \u5b58\u50a8\u5b57\u7b26\u4e32\u7684\u65b9\u5f0f\uff0c\u6821\u5bf9\u89c4\u5219\u4e5f\u53ef\u4ee5\u79f0\u4e3a\u6392\u5e8f\u89c4\u5219\uff0c\u662f\u6307\u5728\u540c\u4e00\u4e2a\u5b57\u7b26\u96c6\u5185\u5b57\u7b26\u4e4b\u95f4\u7684\u6bd4\u8f83\u89c4\u5219\u3002\u5b57\u7b26\u96c6\u548c\u6821\u5bf9\u89c4\u5219\u662f\u4e00\u5bf9\u591a\u7684\u5173\u7cfb\uff0c\u6bcf\u4e2a\u5b57\u7b26\u96c6\u90fd\u6709\u4e00\u4e2a\u9ed8\u8ba4\u7684\u6821\u5bf9\u89c4\u5219\u3002<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    \u63a8\u8350\u5927\u5bb6\u4f7f\u7528: utf8mb4 \u3002<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    utf-8: \u4f7f\u75284\u4e2a\u5b57\u8282\u6765\u4ee3\u8868\u4e00\u4e2a\u5b57\u7b26\u3002MySQL\u5b98\u65b9\u91cc\u9762\u6709\u4e00\u4e2autf8 ,\u4f46\u662f\u5b83\u662f\u4e09\u4e2a\u5b57\u8282\u7684\uff0c\u6709\u4e00\u4e9b\u56db\u4e2a\u5b57\u8282\u7684\u8868\u793a\u4e0d\u4e86\u3002<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    utf8mb4\u624d\u662f\u5f53\u4e0b\u771f\u6b63\u7684utf-8\u3002<\/strong><\/p>\n<\/blockquote>\n\n\n\n
                    \u5b57\u7b26\u96c6\uff0c\u5c31\u662fMySQL\u5b58\u50a8\u6570\u636e\u7684\u65b9\u5f0f\u3002\u6bd4\u5982\u73b0\u5728\u6709\u4e00\u4e2azhansgan \u7684\u5b57\u7b26\u4e32\uff0c\u9700\u8981\u5b58\u50a8\u5230MySQL\u4e2d\u3002\u56e0\u4e3a\u6587\u4ef6\u7cfb\u7edf\u4e2d\uff0c\u53ea\u80fd\u5b58\u4e8c\u8fdb\u5236\u7684\u3002\u6240\u4ee5\u9700\u8981\u628azhangsan\u8fdb\u884c\u7f16\u7801\uff0c\u7f16\u7801\u4e4b\u540e\uff0c\u624d\u80fd\u5199\u5165\u5230\u78c1\u76d8\u91cc\u9762\u3002<\/p>\n\n\n\n
                    \u6821\u5bf9\u89c4\u5219\uff0c\u7528\u4e8e\u6bd4\u8f83\u548c\u6392\u5e8f\u5b57\u7b26\u4e32\u5b57\u7b26\u96c6\u7684\u4e00\u5957\u89c4\u5219\u3002\u6bd4\u5982\u6709\u4e00\u4e9b\u6392\u5e8f\u89c4\u5219\u533a\u5206\u5927\u5c0f\u5199\uff0c\u6709\u4e00\u4e9b\u6392\u5e8f\u89c4\u5219\u4e0d\u533a\u5206\u5927\u5c0f\u5199.<\/p>\n\n\n\n
                    <span style=color:red;background:yellow><b>\u6ce8\u610f\uff1a<\/b><\/span>\u5982\u679c\u4e0d\u8bbe\u7f6e\u5b57\u7b26\u96c6\uff0c\u6709\u53ef\u80fd\u4f1a\u4f7f\u7528\u4e86\u9ed8\u8ba4\u7684latin1\uff0c\u5bfc\u81f4\u5b58\u50a8\u4e2d\u6587\u62a5\u9519\u3002\uff08\u5c24\u5176\u662f\u4f7f\u7528Navicat\u4e4b\u7c7b\u7684\u8f6f\u4ef6\u7684\u65f6\u5019\uff09<\/p>\n\n\n\n
                    -- \u4e0b\u9762\u8fd9\u4e24\u4e2a\u4e0d\u91cd\u8981\uff0c\u6307\u5bfc\u80fd\u591f\u67e5\u8be2\u6240\u6709\u5b57\u7b26\u96c6\u548c\u6821\u5bf9\u89c4\u5219\u5373\u53ef\n-- \u67e5\u770b\u6240\u6709\u7684\u5b57\u7b26\u96c6\nshow character set;\n\n-- \u67e5\u770b\u6240\u6709\u7684\u6821\u5bf9\u89c4\u5219\nshow collation where charset='utf8mb4';<\/code><\/pre>\n\n\n\n
                    \u5220\u9664\u6570\u636e\u5e93<\/strong><\/p>\n\n\n\n
                    -- \u5220\u9664\u6570\u636e\u5e93\ndrop database <\u6570\u636e\u5e93\u540d\u79f0>;<\/code><\/pre>\n\n\n\n
                    \u4fee\u6539\u6570\u636e\u5e93<\/strong><\/p>\n\n\n\n
                    -- \u4fee\u6539\u6307\u5b9a\u5e93\u7684  \u5b57\u7b26\u96c6\u548c\u6821\u5bf9\u89c4\u5219\nalter database <\u6570\u636e\u5e93\u540d\u79f0> character set <\u5b57\u7b26\u96c6> collate <\u6821\u5bf9\u89c4\u5219>;<\/code><\/pre>\n\n\n\n
                    \n
                    \u6570\u636e\u5e93\u4e2d\u672a\u63d0\u4f9b\u6539\u5e93\u540d\u7684\u64cd\u4f5c,\u53ea\u63d0\u4f9b\u4fee\u6539\u5b57\u7b26\u96c6\u548c\u6821\u5bf9\u89c4\u5219\u3002<\/p>\n<\/blockquote>\n\n\n\n
                    \u9009\u62e9\u6570\u636e\u5e93<\/strong><\/p>\n\n\n\n
                    -- \u9009\u62e9\u4f7f\u7528\u6307\u5b9a\u7684\u6570\u636e\u5e93\nuse <\u6570\u636e\u5e93\u540d\u79f0>;<\/code><\/pre>\n\n\n\n
                    \n
                    \u4e00\u4e2aMySQL\u7cfb\u7edf\u4e2d, \u7ba1\u7406\u591a\u4e2a\u6570\u636e\u5e93\u3002 \u6211\u4eec\u53ea\u6709\u8fdb\u5165\u5bf9\u5e94\u7684\u6570\u636e\u5e93\u4e2d, \u624d\u80fd\u8fdb\u4e00\u6b65\u64cd\u4f5c\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u3002<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    \u56e0\u4e3a\u8868\u90fd\u662f\u5728\u5e93\u91cc\u9762\u7684\u3002\u6240\u4ee5\u9700\u8981\u8fdb\u5165\u5e93\u4e2d\uff0c\u518d\u5bf9\u8868\u8fdb\u884c\u5404\u79cd\u64cd\u4f5c\u3002<\/p>\n<\/blockquote>\n\n\n\n
                    \u64cd\u4f5c\u8868<\/h3>\n\n\n\n
                    \u5728\u8868\u683c\u7ea7\u522b\u7684\u6240\u6709\u64cd\u4f5c\uff0c\u90fd\u5fc5\u987b\u8981\u5728\u6570\u636e\u5e93\u4e2d\uff0c\u6240\u4ee5\u5fc5\u987b\u8981\u5148\u9009\u62e9\u6570\u636e\u5e93\u3002<\/p>\n\n\n\n
                    -- \u9009\u62e9\u6307\u5b9a\u7684\u6570\u636e\u5e93\nuse <\u6570\u636e\u5e93\u540d\u79f0>;<\/code><\/pre>\n\n\n\n
                    \u67e5\u770b\u8868<\/strong><\/p>\n\n\n\n
                    -- \u67e5\u770b\u5f53\u524d\u6570\u636e\u5e93\u6240\u6709\u8868(\u65b0\u521b\u5efa\u7684\u6570\u636e\u5e93\u8868\u4e3a\u7a7a)\nshow tables;<\/code><\/pre>\n\n\n\n
                    —<\/p>\n\n\n\n
                    -- \u67e5\u770b\u8868\u683c\u7ed3\u6784(\u6709\u54ea\u4e9b\u5217\uff0c\u4ee5\u53ca\u5217\u7684\u7c7b\u578b)\ndesc <\u8868\u540d>;\ndescribe <\u8868\u540d>;<\/code><\/pre>\n\n\n\n
                    —<\/p>\n\n\n\n
                    -- \u67e5\u770b\u8868\u7684\u521b\u5efa\u8bed\u53e5\u3002\u83b7\u53d6\u51fa\u6765\u7684\u8bed\u53e5\uff0c\u53ef\u4ee5\u76f4\u63a5\u8fd0\u884c\uff0c\uff08\u6539\u6539\u8868\u540d\uff09\nshow create table <\u8868\u540d>;<\/code><\/pre>\n\n\n\n
                    \u521b\u5efa\u8868<\/strong><\/p>\n\n\n\n
                    -- \u521b\u5efa\u8868\u683c\u7684\u5199\u6cd5\u3002\ncreate table <\u8868\u540d> ( <\u5217\u540d> <\u5217\u7c7b\u578b> ,<\u5217\u540d> <\u5217\u7c7b\u578b> ,...,<\u5217\u540d> <\u5217\u7c7b\u578b> )<\/code><\/pre>\n\n\n\n
                    \u5217\u540d<\/strong><\/p>\n\n\n\n
                    \u5217\u540d\u4e00\u822c\u91c7\u7528\u4e0b\u5212\u7ebf\u547d\u540d\u6cd5\uff01<\/p>\n\n\n\n
                    \u6bd4\u5982create_time,add_time,product_id,category_id<\/p>\n\n\n\n
                    \u5217\u7c7b\u578b<\/strong><\/p>\n\n\n\n
                    \u6570\u5b57(\u6574\u6570\u578b\u3001\u5c0f\u6570)<\/strong><\/p>\n\n\n\n
                    \n
                    – \u6574\u6570<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    – tinyint\uff1a1\u5b57\u8282\u3002<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    – int(integer): 4\u5b57\u8282\u3002<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    – bigint: 8\u5b57\u8282\u3002\u548clong\u6bd4\u8f83\u50cf\u3002<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    – \u5c0f\u6570<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    – float(M,D): 4\u5b57\u8282\u3002\u6d6e\u70b9\u578b<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    – double(M,D): 8\u5b57\u8282\u3002\u6d6e\u70b9\u578b<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    – decimal (M, D)\u00a0 ,dec: \u538b\u7f29\u7684\u201c\u4e25\u683c\u201d\u5b9a\u70b9\u6570M+2 \u4e2a\u5b57\u8282\u3002\u5b9a\u70b9\u578b \u3002<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    \u6d6e\u70b9\u6570\u76f8\u5bf9\u4e8e\u5b9a\u70b9\u6570\u7684\u4f18\u70b9\u662f\u5728\u957f\u5ea6\u4e00\u5b9a\u7684\u60c5\u51b5\u4e0b\uff0c\u6d6e\u70b9\u6570\u80fd\u591f\u8868\u793a\u66f4\u5927\u7684\u8303\u56f4\uff1b\u7f3a\u70b9\u662f\u4f1a\u5f15\u8d77\u7cbe\u5ea6\u95ee\u9898\u3002<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    \u8bf4\u660e\uff1aM\u4ee3\u8868\u7684\u662f\u5141\u8bb8\u5b58\u50a8\u7684\u6700\u5927\u4f4d\u6570\uff0cD\u4ee3\u8868\u662f\u5c0f\u6570\u4f4d\u6570\u3002\u4e5f\u5c31\u662f\u7559\u7ed9\u6574\u6570\u7684\u662f M-D\u4f4d\u3002\u5982\u679c\u6574\u6570\u8d85\u4e86\uff0c\u76f4\u63a5\u62a5\u9519\uff0c\u5982\u679c\u5c0f\u6570\u8d85\u4e86\uff0c\u4f1a\u56db\u820d\u4e94\u5165\u3002<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    float(5,2) \u4ee3\u8868\u53ef\u4ee5\u5b58\u50a8\u6700\u5927\u4e3a 999.99 \u7684\u6570\u5b57\uff0c\u603b\u5171\u67095\u4f4d\u6570\u5b57\uff0c\u5176\u4e2d2\u4f4d\u5728\u5c0f\u6570\u70b9\u53f3\u4fa7\u3002<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    – \u5982\u679c\u6574\u6570\u8d85\u4e86\u3002 —\u4f1a\u62a5\u9519\u3002Out of range<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    – \u5982\u679c\u5c0f\u6570\u8d85\u4e86\u3002 — \u56db\u820d\u4e94\u5165 100.6666 –\u300b 100.67<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    \u5b58\u94b1\u7684\u65f6\u5019\uff1a \u5982\u679c\u4e4b\u524d\u662f100.331 \u5343\u4e07\u4e0d\u80fd\u5b58\u50a8\u6210\u540e\u9762100.33 \u8fd9\u91cc\u5efa\u8bae\u4f7f\u7528decimal(6,3)<\/strong><\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    \u5bf9\u4e00\u4e9b\u7cbe\u5ea6\u8981\u6c42\u6bd4\u8f83\u9ad8\u7684\u6570\u636e\uff08\u8d27\u5e01\u6570\u636e\u3001\u79d1\u5b66\u6570\u636e\uff09\uff0c\u4f7f\u7528DECIMAL \u3002<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    \u6216\u8005\u4f7f\u7528\u5b57\u7b26\u4e32\u7684\u5f62\u5f0f\u3002<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    \u5728 MySQL \u4e2d\uff0c\u5b9a\u70b9\u6570\u4ee5\u5b57\u7b26\u4e32\u5f62\u5f0f\u5b58\u50a8\uff0c\u5728\u5bf9\u7cbe\u5ea6\u8981\u6c42\u6bd4\u8f83\u9ad8\u7684\u65f6\u5019\uff08\u5982\u8d27\u5e01\u3001\u79d1\u5b66\u6570\u636e\uff09\uff0c\u4f7f\u7528 DECIMAL \u7684\u7c7b\u578b\u6bd4\u8f83\u597d\uff0c\u53e6\u5916\u4e24\u4e2a\u6d6e\u70b9\u6570\u8fdb\u884c\u51cf\u6cd5\u548c\u6bd4\u8f83\u8fd0\u7b97\u65f6\u4e5f\u5bb9\u6613\u51fa\u95ee\u9898\uff0c\u6240\u4ee5\u5728\u4f7f\u7528\u6d6e\u70b9\u6570\u65f6\u9700\u8981\u6ce8\u610f\uff0c\u5e76\u5c3d\u91cf\u907f\u514d\u505a\u6d6e\u70b9\u6570\u6bd4\u8f83\u3002<\/p>\n<\/blockquote>\n\n\n\n
                    —<\/p>\n\n\n\n
                    \n
                    \u65e5\u671f<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    – year\uff1a\u5e74(YYYY)\u3002<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    – time: \u65f6\u5206\u79d2(HH:MM:SS)\u3002<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    – date: \u5e74\u6708\u65e5(YYYY-MM-DD)\u3002<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    – datetime: \u5e74\u6708\u65e5\u65f6\u5206\u79d2\u3002(YYYY-MM-DD HH:MM:SS)\u3002<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    – timestamp: \u5e74\u6708\u65e5\u65f6\u5206\u79d2\u3002(YYYY-MM-DD HH:MM:SS)\u3002<\/p>\n<\/blockquote>\n\n\n\n
                    timestamp\uff1a\u65f6\u533a \u4fe1\u606f\u4e0d\u540c \u83b7\u53d6\u5230\u7684\u503c\u4e0d\u540c<\/p>\n\n\n\n
                    \n
                    \u5b57\u7b26\u4e32<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    – char(M): \u5b9a\u957f\u5b57\u7b26\u4e32\uff0c\u8bbe\u7f6e\u4e86\u957f\u5ea6\uff0c\u65e0\u8bba\u5b58\u50a8\u591a\u5c11\u957f\u5ea6\u7684\u5b57\u7b26\u4e32\uff0c\u90fd\u4f1a\u5360\u6ee1M\u3002<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    – varchar(M)\uff1a\u53d8\u957f\u5b57\u7b26\u4e32\uff0c\u4f1a\u75281-2\u5b57\u8282\u6765\u5b58\u50a8\u957f\u5ea6\u3002\u4e5f\u5c31\u662f \u5b9e\u9645\u957f\u5ea6+1(2)\u3002\u6240\u6709\u7684\u5217\u3002\u6700\u5927\u957f\u5ea665535\u5b57\u8282\u3002<\/strong><\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    – text\uff1a\u6587\u672c\u5b57\u7b26\u4e32\uff0c\u4f1a\u75282\u5b57\u8282\u6765\u5b58\u50a8\u957f\u5ea6\u3002\u6700\u5927\u957f\u5ea665535\u5b57\u7b26\uff0c\u7ea664K\u3002<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    – longtext\uff1a\u5927\u6587\u672c\u5b57\u7b26\u4e32\u3002\u4f1a\u4f7f\u75284\u5b57\u8282\u5b58\u50a8\u957f\u5ea6\u3002\u6700\u5927\u957f\u5ea62^32\uff0c\u7ea64G\u3002<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    \u6ce8\u610f\uff1a<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    – \u5982\u679c\u4f60\u9700\u8981\u5b58\u50a8\u7684\u5b57\u7b26\u4e32\u57282000\u4ee5\u5185\uff0c\u53ef\u4ee5\u4f7f\u7528varchar()\u3002\u5982\u679c\u8d85\u8fc7\uff0c\u5efa\u8bae\u4f7f\u7528text\u3002<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    \u6bd4\u5982\u6211\u73b0\u5728\u6709\u4e00\u4e2a\u7535\u5f71 3.8G\u3002\u9700\u8981\u5b58\u600e\u4e48\u529e\uff1f \u628a\u7535\u5f71\uff0c\u627e\u4e2a\u7535\u8111\u5b58\u8d77\u6765\uff0c\u5b58\u8def\u5f84\u3002 D:\/data1\/\u5b66\u4e60.mp4<\/code>\u3002\u6570\u636e\u5e93\u662f\u5b58\u653e\u6570\u636e\u7684\uff0c\u4f46\u662f\u4e0d\u80fd\u5b58\u653e\u8fd9\u79cd\u5927\u7684\u89c6\u9891\u3002<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    \u4f46\u662f\u4e00\u822c\u4f7f\u7528varchar\u3002\u4e0d\u4f1a\u5199\u592a\u591a\u3002 varchar(500) varchar(1000) \u8fd9\u4e2a\u90fd\u662f\u53ef\u4ee5\u7684\u3002\u4f46\u662f\u5982\u679c\u8981\u5199varchar(5000)\u3002\u4e0d\u5efa\u8bae\u4f7f\u7528varchar\u3002<\/p>\n<\/blockquote>\n\n\n\n
                    \u4e3e\u4f8b<\/p>\n\n\n\n
                    \n
                    \u73b0\u5728\u6709\u4e00\u4e2a\u5b66\u751f\u8868\uff0c\u9700\u8981\u5b58\u50a8\u7684\u4fe1\u606f\u5305\u62ec\uff0c\u5b66\u751fid\uff0c\u59d3\u540d\uff0c\u5e74\u9f84\uff0c\u8eab\u9ad8\uff0c\u4f53\u91cd\uff0c\u7c4d\u8d2f\uff0c\u8eab\u4efd\u8bc1\u53f7\uff0c\u8054\u7cfb\u7535\u8bdd<\/p>\n<\/blockquote>\n\n\n\n
                    -- \u521b\u5efa\u4e00\u4e2a\u8868\uff0c\u4e3b\u8981\u662f\u4e09\u4e2a\u95ee\u9898\uff1a\n\n-- 1.\u8868\u540d\n\n-- 2.\u6709\u54ea\u4e9b\u5b57\u6bb5\n\n-- 3.\u5b57\u6bb5\u7684\u7c7b\u578b\u53ca\u957f\u5ea6\n\ncreate table student(\n\nid int,\n\nname varchar(200),\n\nage int,\n\nheight double(10,2),\n\nweight double(10,2),\n\naddress varchar(500),\n\nid_card varchar(50),\n\nphone varchar(20)\n\n);\n\n-- \u5efa\u8868\u8bed\u53e5\u7684\u539f\u5219\u3002\u5e94\u8be5\u7559\u6709\u4e00\u5b9a\u6269\u5c55\u6027\u3002\n\n-- varchar(2) varchar(5) varchar(10) varchar(50) varchar(200)\n\n-- \u5199\u5f97\u591a\uff0c\u5e76\u4e0d\u4e00\u5b9a\u4f1a\u76f4\u63a5\u5360\u7528\u90a3\u4e48\u591a\u3002 varchar(5)\u3002\u5efa\u8868\u7684\u65f6\u5019\u7559\u6709\u6269\u5c55\u7a7a\u95f4\uff0c\u9632\u6b62\u540e\u7eed\u6570\u636e\u91cf\u53d8\u5927\u4e86\u4e4b\u540e\uff0c\u9891\u7e41\u53bb\u6539\u8868\u3002\n\n-- \u6240\u4ee5\u5728\u6700\u5f00\u59cb\u521b\u5efa\u8868\u7684\u65f6\u5019\uff0c\u76f4\u63a5\u5199\u5927\u4e00\u70b9\u70b9\u3002<\/code><\/pre>\n\n\n\n
                    -- \u73b0\u5728\u6709\u4e00\u4e2a\u56fe\u4e66\u4fe1\u606f\u8868\uff0c\u9700\u8981\u5b58\u50a8\u7684\u4fe1\u606f\u5305\u62ec\uff0c\u5e8f\u53f7\uff0c\u4e66\u540d\uff0c\u4f5c\u8005\uff0c\u51fa\u7248\u793e\uff0c\u51fa\u7248\u65e5\u671f\uff0c\u5b9a\u4ef7\uff0c\u5907\u6ce8\n\ncreate table\u00a0book(\n\nid\u00a0int,\n\nbook_name\u00a0varchar(200),\n\nauthor varchar(100),\n\npress varchar(200),\n\npublication_date date,\n\nprice decimal(10,2),\n\ncomment varchar(1000)\n\n);\n\n-- \u6709\u4e00\u4e9b\u5b57\u6bb5\uff0c\u53ef\u4ee5\u6839\u636e\u4e0a\u4e0b\u6587\u8fdb\u884c\u63a8\u65ad\uff0c\u6240\u4ee5\u6211\u4eec\u4e5f\u53ef\u4ee5\u505a\u4e00\u70b9\u7701\u7565\n\n-- \u6bd4\u5982\u5728\u4e66\u8fd9\u5f20\u8868\u91cc\uff0c\u51fa\u73b0\u4e86name\uff0c\u6211\u4eec\u4f1a\u76f4\u63a5\u8ba4\u4e3aname\u662f\u4e66\u7684\u540d\u5b57\uff0c\u4e0d\u4f1a\u8ba4\u4e3a\u662f\u4f5c\u8005\u6216\u8005\u5176\u4ed6\u4eba\u7684\u540d\u5b57\uff0c\u6240\u4ee5\u53ef\u4ee5\u7701\u7565\u4e00\u70b9\u70b9\u3002\n\n-- book_name -> name\n\n-- \u53ef\u4ee5\u6839\u636e\u4e0a\u4e0b\u6587\u63a8\u65ad\u3002<\/code><\/pre>\n\n\n\n
                    \u5220\u9664\u8868<\/strong><\/p>\n\n\n\n
                    drop table <\u8868\u540d>;<\/code><\/pre>\n\n\n\n
                    \u4fee\u6539\u8868<\/h4>\n\n\n\n
                    \u77e5\u9053\u6709\u8fd9\u4e2a\u4e1c\u897f\u5c31\u53ef\u4ee5\u4e86\uff0c\u4f46\u662f\u5728\u5de5\u4f5c\u4e2d\uff0c\u5982\u679c\u6709\u8fd9\u79cd\u9700\u6c42\uff0c\u4f60\u4e0d\u8981\u53bb\u64cd\u4f5c\u3002\u5728\u81ea\u5df1\u7684\u6570\u636e\u5e93\u4e0a\u7ec3\u4e60\u4e00\u4e0b\u65e0\u6240\u8c13\u3002<\/p>\n\n\n\n
                    \u8868\u540d<\/p>\n\n\n\n
                    -- \u4fee\u6539\u8868\u540d\nrename table <\u65e7\u8868\u540d> to <\u65b0\u8868\u540d>;\nalter table <\u65e7\u8868\u540d> rename <\u65b0\u8868\u540d> ;<\/code><\/pre>\n\n\n\n
                    —<\/p>\n\n\n\n
                    \u5b57\u7b26\u96c6\u548c\u6392\u5e8f\u89c4\u5219<\/p>\n\n\n\n
                    -- \u4fee\u6539\u8868\u5b57\u7b26\u96c6 \u6392\u5e8f\u89c4\u5219\nalter table <\u8868\u540d> character set <\u5b57\u7b26\u96c6> collate <\u6821\u5bf9\u89c4\u5219>;<\/code><\/pre>\n\n\n\n
                    \u5217<\/p>\n\n\n\n
                    \u6dfb\u52a0\u5217<\/strong><\/p>\n\n\n\n
                    -- \u6dfb\u52a0\u5217\nalter table <\u8868\u540d> add column <\u5217\u540d> <\u7c7b\u578b>;<\/code><\/pre>\n\n\n\n
                    \u5220\u9664\u5217<\/strong><\/p>\n\n\n\n
                    -- \u5220\u9664\u5217\nalter table <\u8868\u540d> drop column <\u5217\u540d>;<\/code><\/pre>\n\n\n\n
                    \u4fee\u6539\u5217\u7c7b\u578b<\/strong><\/p>\n\n\n\n
                    -- \u4fee\u6539\u67d0\u5217\u7684\u7c7b\u578b\nalter table <\u8868\u540d> modify column <\u5217\u540d> <\u7c7b\u578b>;<\/code><\/pre>\n\n\n\n
                    \u6ce8\u610f\u4e8b\u9879\uff1a\u4fee\u6539\u8868\u7ed3\u6784\u7684\u65f6\u5019\u53ef\u4ee5\u4f7f\u7528\u56fe\u5f62\u5316\u9875\u9762\uff0c\u4f46\u662f\u8981\u628aSQL\u8bed\u53e5\u7ed9\u5b83\u4fdd\u5b58\u8d77\u6765<\/strong><\/p>\n\n\n\n
                    \u64cd\u4f5c\u6570\u636e\u2757\u2757\u2757<\/h3>\n\n\n\n
                    \u64cd\u4f5c\u6570\u636e\u662f\u4eca\u540e\u5927\u5bb6\u6700\u91cd\u8981\u7684\u5185\u5bb9<\/p>\n\n\n\n
                    \n
                    CRUD\u5de5\u7a0b\u5e08 => CRUD\u5bf9\u5e94\u7684\u662f\u589e\u5220\u6539\u67e5<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    \u589e\u52a0(Create)\u3001\u8bfb\u53d6(Read)\u3001\u66f4\u65b0(Update)\u548c\u5220\u9664(Delete)<\/p>\n<\/blockquote>\n\n\n\n
                    \u67e5\u8be2\u6570\u636e<\/strong><\/p>\n\n\n\n
                    -- \u67e5\u8be2\u6570\u636e\nselect [\u5217\u540d1],[\u5217\u540d2],...,[\u5217\u540dn] from <\u8868\u540d>;<\/code><\/pre>\n\n\n\n
                    \u5982\u679c\u8981\u67e5\u8be2\u6240\u6709\u5217\u7684\u5185\u5bb9\u7684\u8bdd<\/p>\n\n\n\n
                    -- \u4f7f\u7528*\u6765\u4ee3\u8868\u6240\u6709\u5217\nselect * from <\u8868\u540d>;<\/code><\/pre>\n\n\n\n
                    \u65b0\u589e\u6570\u636e<\/strong><\/p>\n\n\n\n
                    -- \u65b9\u5f0f1\uff0c\u5148\u8bbe\u5b9a\u63d2\u5165\u7684\u5217\u7684\u987a\u5e8f\uff0c\u7136\u540e\u6309\u7167\u987a\u5e8f\u63d0\u4f9b\u81f3\ninsert into <\u8868\u540d> ([\u5217\u540d1],[\u5217\u540d2],...,[\u5217\u540dn]) values ([\u503c1],[\u503c2],...,[\u503cn]);<\/code><\/pre>\n\n\n\n
                    —<\/p>\n\n\n\n
                    -- \u65b9\u5f0f2\uff0c\u4e0d\u9700\u8981\u6307\u5b9a\u5217\u540d\uff0c\u4f46\u662f\u6240\u6709\u5217\u90fd\u9700\u8981\u63d0\u4f9b\u503c(\u4e0d\u5efa\u8bae\u4fee\u6539\u6570\u636e\u5e93\u8868\u7ed3\u6784\u4f1a\u5bfc\u81f4\u5df2\u6709\u7684SQL\u8bed\u53e5\u6267\u884c\u51fa\u73b0\u95ee\u9898)\ninsert into <\u8868\u540d> values ([\u503c1],[\u503c2],...,[\u503cn]);<\/code><\/pre>\n\n\n\n
                    —<\/p>\n\n\n\n
                    -- \u65b9\u5f0f3\uff0c\u4f7f\u7528set\u65b9\u5f0f\uff0c\u6307\u5b9a\u5217\u4ee5\u53ca\u503c\ninsert into <\u8868\u540d> set [\u5217\u540d]=[\u503c],[\u5217\u540d]=[\u503c],...,[\u5217\u540d]=[\u503c];<\/code><\/pre>\n\n\n\n
                    \u4fee\u6539\u6570\u636e<\/strong><\/p>\n\n\n\n
                    -- \u66f4\u65b0\u6570\u636e\nupdate <\u8868\u540d> set <\u5217\u540d>=[\u503c],<\u5217\u540d>=[\u503c],...,<\u5217\u540d>=[\u503c];<\/code><\/pre>\n\n\n\n
                    \u5220\u9664\u6570\u636e<\/strong><\/p>\n\n\n\n
                    -- \u5220\u9664\u6570\u636e\ndelete from <\u8868\u540d>;<\/code><\/pre>\n\n\n\n
                    \u8865\u5145\u8bf4\u660e<\/h3>\n\n\n\n
                    \u5173\u4e8e\u5b57\u7b26\u96c6\u548c\u6821\u5bf9\u89c4\u5219\u7684\u8bf4\u660e<\/strong><\/p>\n\n\n\n
                    \u6709\u56db\u4e2a\u5c42\u6b21\u7684\u5b57\u7b26\u96c6\u548c\u6821\u5bf9\u89c4\u5219\u3002<\/p>\n\n\n\n
                    \n
                    – \u6570\u636e\u5e93\u670d\u52a1 service<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    – \u6570\u636e\u5e93 database<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    – \u8868 table<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    – \u5217 column<\/p>\n<\/blockquote>\n\n\n\n
                    \"\"<\/div><\/figure>\n\n\n\n
                    \u9ed8\u8ba4\u503c\u5411\u4e0a\u7ee7\u627f\uff0c\u82e5\u521b\u5efa\u540e\u4fee\u6539\uff0c\u4e0d\u5f71\u54cd\u5df2\u6709\u5b50\u5185\u5bb9\u7684\u5b57\u7b26\u96c6\u3002<\/p>\n\n\n\n
                    \u4e3e\u4e2a\u4f8b\u5b50\uff1a\u5982\u679c\u521b\u5efa\u65f6\u6570\u636e\u5e93\u7684\u5b57\u7b26\u96c6\u662futf8mb4,\u5982\u679c\u521b\u5efa\u8868\u7684\u8bdd\u6ca1\u6709\u6307\u5b9a\u5b57\u7b26\u96c6\uff0c\u5219\u8868\u7684\u5b57\u7b26\u96c6\u4f1a\u7ee7\u627f\u6570\u636e\u5e93\u7684\u5b57\u7b26\u96c6\uff0c\u4e5f\u662futf8mb4;\u6b64\u65f6\u5982\u679c\u4fee\u6539\u6570\u636e\u5e93\u7684\u5b57\u7b26\u96c6\u4e3autf8\uff0c\u90a3\u4e48\u8fd9\u4e2a\u6570\u636e\u5e93\u5df2\u7ecf\u521b\u5efa\u7684\u8868\u7684\u5b57\u7b26\u96c6\u4e0d\u4f1a\u968f\u4e4b\u4fee\u6539<\/p>\n\n\n\n
                    \u8fd9\u65f6\u5019\u6211\u4eec\u4e00\u822c\u5982\u4f55\u505a\uff0c\u5efa\u8bae\u628a\u8868\u5220\u4e86\uff0c\u91cd\u65b0\u521b\u5efa<\/p>\n\n\n\n
                    \u6ce8\u91ca\u7684\u8bf4\u660e<\/strong><\/p>\n\n\n\n
                    -- <\u6ce8\u91ca>\n\n-- \u4f7f\u7528\u4e24\u4e2a\u6a2a\u7ebf\u8fdb\u884c\u6ce8\u91ca\u7684\u65f6\u5019\u3002\u540e\u9762\u5fc5\u987b\u8ddf\u7a7a\u683c\n\n# <\u6ce8\u91ca>\n\n\/*\n  <\u6ce8\u91ca>\n*\/    <\/code><\/pre>\n\n\n\n
                    \n
                    \u6ce8\u610f:<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    \u5728\u6570\u636e\u5e93\u8bed\u53e5\u4e2d\u5982\u679c\u6211\u4eec\u9700\u8981\u6ce8\u91ca\u67d0\u4e9b\u5185\u5bb9, \u4e00\u822c\u6709\u4e09\u79cd\u65b9\u5f0f\u3002<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    --<\/code> \u6ce8\u91ca\u7b26(\u8981\u6ce8\u610f\u7684\u662f--<\/code>\u4e4b\u540e\u8981\u6709\u4e00\u4e2a\u7a7a\u683c\u518d\u63a5\u7740\u4e66\u5199\u6ce8\u91ca\u5185\u5bb9)<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    #<\/code> \u6ce8\u91ca\u7b26 (\u4e4b\u540e\u4e0d\u9700\u8981\u7a7a\u683c)<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    \/* *\/<\/code> \u6ce8\u91ca\u7b26 (\u4e00\u822c\u7528\u4e8e\u591a\u884c\u6ce8\u91ca)<\/p>\n<\/blockquote>\n\n\n\n
                    \u547d\u540d\u6cd5<\/strong><\/p>\n\n\n\n
                    \u4ee5Teacher Info\u8fd9\u4e2a\u590d\u5408\u8bcd\uff0c\u91c7\u7528\u4e0d\u540c\u7684\u547d\u540d\u65b9\u5f0f\u6765\u5199\u4e00\u4e0b<\/p>\n\n\n\n
                    \u7c7b\u578b<\/th>\u547d\u540d<\/th>\u573a\u666f<\/th><\/tr><\/thead>
                    \u5c0f\u9a7c\u5cf0\u547d\u540d<\/strong><\/td>teacherInfo<\/strong><\/td>\u53d8\u91cf\u540d\u3001\u65b9\u6cd5\u540d<\/td><\/tr>
                    \u5927\u9a7c\u5cf0\u547d\u540d<\/strong><\/td>TeacherInfo<\/strong><\/td>\u63a5\u53e3\u540d\u3001\u7c7b\u540d\u3001\u5c5e\u6027\u3001\u547d\u540d\u7a7a\u95f4<\/td><\/tr>
                    \u4e0b\u5212\u7ebf\u547d\u540d<\/strong><\/td>teacher_info<\/strong><\/td>\u6570\u636e\u5e93\uff08\u5e93\u3001\u8868\u3001\u5217\uff09\u3001\u6587\u4ef6\u540d<\/td><\/tr>
                    \u8fde\u5b57\u7b26\u547d\u540d<\/strong><\/td>teacher-info<\/strong><\/td>CSS\u3001(SpringBoot)\u914d\u7f6e\u6587\u4ef6<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
                    SQL\u5173\u952e\u5b57(\u96be\u70b9)<\/h2>\n\n\n\n
                    \u9996\u5148\u8fdb\u884c\u6570\u636e\u51c6\u5907\uff0c\u53ef\u4ee5\u5c06\u4e00\u4e0b\u5185\u5bb9\u653e\u5230navicat\u4e2d\u6267\u884c<\/code><\/p>\n\n\n\n
                    CREATE TABLE `student_t`  (\n\t`id` int(11)  PRIMARY KEY  AUTO_INCREMENT,\n\t`name` varchar(255)   ,\n\t`class` varchar(255)  ,\n\t`chinese` float  ,\n\t`english` float  ,\n\t`math` float  \n) ;\nINSERT INTO student_t (id, name, class, chinese, english, math) VALUES (1, '\u6b66\u677e', '\u4e00\u73ed', 70, 90, 60);\nINSERT INTO student_t VALUES (2, '\u6797\u51b2', '\u4e00\u73ed', 70, 90, 90);\nINSERT INTO student_t VALUES (3, '\u677e\u6c5f', '\u4e00\u73ed', 90, 90, 20);\nINSERT INTO student_t VALUES (4, '\u8d3e\u740f', '\u4e8c\u73ed', 60, 60, 60);\nINSERT INTO student_t VALUES (5, '\u8d3e\u5b9d\u7389', '\u4e8c\u73ed', 95, 80, 5); \nINSERT INTO student_t VALUES (6, '\u8d3e\u73af', '\u4e8c\u73ed', 25, 25, 5); \nINSERT INTO student_t VALUES (7, '\u66f9\u64cd', '\u4e09\u73ed', 90, 90, 90); \nINSERT INTO student_t VALUES (8, '\u66f9\u4e15', '\u4e09\u73ed', 90, 80, 80); \nINSERT INTO student_t VALUES (9, '\u66f9\u690d', '\u4e09\u73ed', 98, 90, 80); \nINSERT INTO student_t VALUES (10, '\u5218\u5907', '\u4e09\u73ed', 95, 90, 80); \nINSERT INTO student_t VALUES (11, '\u8bf8\u845b\u4eae', '\u4e09\u73ed', 98, 95, 95); \nINSERT INTO student_t VALUES (12, '\u5b59\u6743', '\u4e09\u73ed', 80, 90, 80); \nINSERT INTO student_t (id) VALUES (13);<\/code><\/pre>\n\n\n\n
                    where => \u6761\u4ef6<\/h3>\n\n\n\n
                    \n
                    \u4f7f\u7528 WHERE \u5173\u952e\u5b57\u5e76\u6307\u5b9a\u67e5\u8be2\u6761\u4ef6|\u8868\u8fbe\u5f0f<\/code>, \u4ece\u6570\u636e\u8868<\/code>\u4e2d\u83b7\u5f97\u6ee1\u8db3\u6761\u4ef6<\/code>\u7684\u6570\u636e\u5185\u5bb9.<\/p>\n<\/blockquote>\n\n\n\n
                    \n
                    \u4f7f\u7528\u4f4d\u7f6e\uff1a\u67e5\u8be2\u8bed\u53e5\uff08select\uff09\uff0c\u66f4\u65b0\u8bed\u53e5\uff08update\uff09\uff0c\u5220\u9664\u8bed\u53e5\uff08delete\uff09\u3002\u5728update\u91cc\uff0c\u548cdelete\u5fc5\u987b\u8981\u7528\u3002<\/strong><\/p>\n<\/blockquote>\n\n\n\n
                    -- \u4e3e\u4f8b\n-- \u60f3\u627eid\u4e3a1\u7684\nselect * from student_t where id=1;\n-- chinese \u5927\u4e8e90\u7684\nselect * from student_t where chinese > 90;\n-- \u60f3\u627e\u5230id\u5927\u4e8e10\u7684\nselect id, name from student_t where id > 10;<\/code><\/pre>\n\n\n\n
                    \u4f7f\u7528 WHERE \u5173\u952e\u5b57\u5e76\u6307\u5b9a\u67e5\u8be2\u6761\u4ef6|\u8868\u8fbe\u5f0f<\/code>, \u4ece\u6570\u636e\u8868<\/code>\u4e2d\u83b7\u5f97\u6ee1\u8db3\u6761\u4ef6<\/code>\u7684\u6570\u636e\u5185\u5bb9.<\/p>\n\n\n\n
                    \u5728\u6784\u5efaWhere\u7684\u67e5\u8be2\u6761\u4ef6|\u8868\u8fbe\u5f0f<\/code>\u7684\u8fc7\u7a0b\u4e2d, \u6211\u4eec\u53ef\u80fd\u9700\u8981\u4e86\u89e3\u5230\u4e00\u4e9b\u91cd\u8981\u7684SQL\u8fd0\u7b97\u7b26<\/code><\/strong><\/p>\n\n\n\n
                    \u5728where\u8bed\u53e5\u7684\u540e\u9762\uff0c\u6211\u4eec\u53ef\u4ee5\u7528\u5230\u7b97\u6570\u8fd0\u7b97\u7b26\u3002\u4e5f\u53ef\u4ee5\u7528\u5230\u903b\u8f91\u8fd0\u7b97\u7b26\u3002<\/p>\n\n\n\n
                    \u5728\u67e5\u8be2\u7ed3\u679c\u4e2d\uff0c\u6211\u4eec\u4e5f\u53ef\u4ee5\u4f7f\u7528\u7b97\u672f\u8fd0\u7b97\u7b26\u3002<\/p>\n\n\n\n
                    \u7b97\u672f\u8fd0\u7b97\u7b26<\/strong><\/p>\n\n\n\n
                    \u8fd0\u7b97\u7b26<\/th>\u4f5c\u7528<\/th><\/tr><\/thead>
                    +<\/td>\u52a0<\/td><\/tr>
                    –<\/td>\u51cf<\/td><\/tr>
                    *<\/td>\u4e58<\/td><\/tr>
                    \/<\/td>\u9664<\/td><\/tr>
                    %<\/td>\u53d6\u4f59<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
                    -- \u7b97\u6570\u8fd0\u7b97\u7b26\uff0c\u4e0d\u4ec5\u53ef\u4ee5\u51fa\u73b0\u5728where\u4e2d\uff0c\u8fd8\u53ef\u4ee5\u51fa\u73b0\u5728\u67e5\u8be2\u5217\u4e2d\u3002\n\n-- \u8bed\u6570\u5916\u603b\u5206 \u5c0f\u4e8e180\u7684\n-- \u8bed\u6587-\u6570\u5b66 \u5206\u5dee\u5927\u4e8e30\u7684\n-- \u52a0\u6743\u5e73\u5747\uff0c\u6309\u8bed\u65870.5 \u82f1\u8bed0.1 \u6570\u5b660.4\u6c42\u52a0\u6743\u5e73\u5747\u5206\n-- \u52a0\u6743\u5e73\u5747\u5206\uff0c\u5c0f\u4e8e\u7b49\u4e8e60\u7684\n-- \u6c42\u6bcf\u4e2a\u4eba\u7684\u5e73\u5747\u5206\uff0c\u8bed\u6570\u5916\u4e09\u79d1\n-- \u6c42\u6bcf\u4e2a\u4eba\u7684\u5e73\u5747\u5206\uff0c\u53ea\u7b5b\u9009\u51fa\u5e73\u5747\u5206\u5c0f\u4e8e60\u7684\n-- \u627e\u51faid\u662f\u5947\u6570\u7684\n-- \u627e\u8bed\u6587\u6210\u7ee9\u662f\u5076\u6570\u7684\n\n-- eg:\n-- \u8bed\u6570\u5916\u603b\u5206 \u5c0f\u4e8e180\u7684\n\tselect * from student_t where (chinese + english + math) < 180; \n\t\n-- \u8bed\u6587\u548c\u6570\u5b66 \u5206\u5dee\u5927\u4e8e30\u7684\n\tselect * from student_t where (chinese - math) > 30; \n\t\n-- \u52a0\u6743\u5e73\u5747\uff0c\u6309\u8bed\u65870.5 \u82f1\u8bed0.1 \u6570\u5b660.4\u6c42\u52a0\u6743\u5e73\u5747\u5206\n\tselect *, (chinese*0.5 + english*0.1 + math *0.4) from student_t; \n\t\n-- \u52a0\u6743\u5e73\u5747\u5206\uff0c\u5c0f\u4e8e\u7b49\u4e8e60\u7684\n\tselect *, (chinese*0.5 + english*0.1 + math *0.4)  from student_t where (chinese*0.5 + english*0.1 + math *0.4) <= 60 ;  \n\t\n-- \u6c42\u6bcf\u4e2a\u4eba\u7684\u5e73\u5747\u5206\u3002\u8bed\u6570\u5916\n    select *, (chinese + english + math) \/ 3 from student_t ;  \n    \n-- \u6c42\u6bcf\u4e2a\u4eba\u7684\u5e73\u5747\u5206\uff0c\u53ea\u7b5b\u9009\u51fa\u5e73\u5747\u5206\u5c0f\u4e8e60\u7684\n    select *, (chinese + english + math) \/ 3 from student_t  where (chinese + english + math) \/3  < 60; \n\n-- \u627e\u51faid\u662f\u5947\u6570\u7684\nSELECT * FROM student_t WHERE id % 2 = 1;\n-- \u627e\u8bed\u6587\u6210\u7ee9\u662f\u5076\u6570\u7684\nSELECT * FROM student_t WHERE chinese % 2 = 0;\n<\/code><\/pre>\n\n\n\n
                    \u6bd4\u8f83\u548c\u903b\u8f91\u8fd0\u7b97\u7b26<\/strong><\/p>\n\n\n\n
                    \u8fd0\u7b97\u7b26<\/th>\u4f5c\u7528<\/th>\u8fd0\u7b97\u7b26<\/th>\u4f5c\u7528<\/th><\/tr><\/thead>
                    =<\/td>\u7b49\u4e8e<\/td><=><\/td>\u7b49\u4e8e(\u53ef\u6bd4\u8f83null)<\/td><\/tr>
                    !=<\/td>\u4e0d\u7b49\u4e8e<\/td><><\/td>\u4e0d\u7b49\u4e8e<\/td><\/tr>
                    <<\/td>\u5c0f\u4e8e<\/td>><\/td>\u5927\u4e8e<\/td><\/tr>
                    <=<\/td>\u5c0f\u4e8e\u7b49\u4e8e<\/td>>=<\/td>\u5927\u4e8e\u7b49\u4e8e<\/td><\/tr>
                    between and<\/td>\u5728\u95ed\u533a\u95f4\u5185<\/td>like<\/td>\u901a\u914d\u7b26\u5339\u914d(%:\u901a\u914d, _<\/code>\u5360\u4f4d)<\/td><\/tr>
                    is null<\/td>\u662f\u5426\u4e3anull<\/td>is not null<\/td>\u662f\u5426\u4e0d\u4e3anull<\/td><\/tr>
                    in<\/td>\u5728\u5217\u8868\u5185<\/td>not in<\/td>\u4e0d\u5728\u5217\u8868\u5185<\/td><\/tr>
                    and<\/td>\u4e0e<\/td>&&<\/td>\u4e0e<\/td><\/tr>
                    or<\/td>\u6216<\/td>\\<\/td>\\<\/td><\/td>\u6216<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
                    \u9700\u8981\u6ce8\u610f\u7684\uff1a<\/p>\n\n\n\n
                      \n
                    • =<\/code>\u65e0\u6cd5\u5224\u65adnull\u3002\u4e00\u822c\u4f7f\u7528 is null\u6765\u5355\u72ec\u5904\u7406null<\/li>\n\n\n\n
                    • like\u4e2d\uff0c%\u8868\u793a\u901a\u914d\uff0c_<\/code>\u8868\u793a\u5360\u4f4d\u3002 \u4e00\u4e2a_<\/code>\u4ee3\u8868\u4e00\u4e2a\u5b57\u7b26\u3002<\/li>\n<\/ul>\n\n\n\n
                      -- \u67e5\u8be2\u8bed\u6570\u5916\u603b\u6210\u7ee9\u5927\u4e8e 180 \u7684\u540c\u5b66\u4fe1\u606f\uff1b\nselect *,(chinese + english + math) from student_t where (chinese + english + math) > 180;\n\n-- \u67e5\u8be2\u6570\u5b66\u6210\u7ee9\u5728[80\uff0c90]\u533a\u95f4\u7684\u540c\u5b66\u59d3\u540d\uff1b\nselect * from student_t where math between 80 and 90;\n\nselect * from student_t where math >= 80 and math <=90;\n\n-- \u67e5\u8be2\u5404\u79d1\u90fd\u53ca\u683c\u7684\u540c\u5b66\u59d3\u540d\uff1b\nselect * from student_t where chinese >= 60 and math >= 60 and english >= 60;\n\n-- \u67e5\u8be2\u5404\u79d1\u53ea\u8981\u6709\u4e00\u79d1\u53ca\u683c\u7684\u540c\u5b66\u59d3\u540d\uff1b\nselect * from student_t where chinese >= 60 or math >= 60 or english >= 60;\n\nselect * from student_t where id=6;\n\n-- \u67e5\u8be2\u4e00\u73ed\u548c\u4e8c\u73ed\u7684\u540c\u5b66\u4fe1\u606f\uff1b\nselect * from student_t where class = '\u4e00\u73ed' or class = '\u4e8c\u73ed';\nselect * from student_t where class in (\"\u4e00\u73ed\", \"\u4e8c\u73ed\");\n\n-- \u67e5\u8be2\u59d3\u8d3e\u7684\u540c\u5b66\uff08\u53ea\u8981\u59d3\u8d3e\u5c31\u884c\uff09\nSELECT * FROM `student` where name like '\u8d3e%';\n\n-- \u67e5\u8be2\u59d3\u8d3e\u7684\u540c\u5b66\uff0c\u4e24\u4e2a\u5b57\u7684\nSELECT * FROM `student` where name like '\u8d3e_';\n\n-- \u67e5\u8be2\u8bed\u6587\u5206\u6570\u5728 60 \u621690\u7684\u540c\u5b66\nSELECT * FROM `student` where chinese in (60,90);<\/code><\/pre>\n\n\n\n
                      distinct => \u53bb\u91cd<\/h3>\n\n\n\n
                      \u83b7\u53d6\u67d0\u4e2a\u5217\u7684\u4e0d\u91cd\u590d\u503c\u3002\u6216\u8005\u662f\u67d0\u4e9b\u5217\u7684\u4e0d\u91cd\u590d\u503c<\/p>\n\n\n\n
                      SELECT DISTINCT <\u5b57\u6bb5\u540d> FROM <\u8868\u540d>;<\/code><\/pre>\n\n\n\n
                      \n
                      \u4f7f\u7528DISTINCT<\/code>\u5bf9\u6570\u636e\u8868\u4e2d\u4e00\u4e2a\u6216\u591a\u4e2a\u5b57\u6bb5<\/code>\u91cd\u590d\u7684\u6570\u636e\u8fdb\u884c\u8fc7\u6ee4\uff0c\u91cd\u590d\u7684\u6570\u636e\u53ea\u8fd4\u56de\u5176\u4e00\u6761<\/code>\u6570\u636e\u7ed9\u7528\u6237.<\/p>\n<\/blockquote>\n\n\n\n
                      \n
                      \u4ec0\u4e48\u53eb\u91cd\u590d\uff1a\u5c31\u662f\u591a\u4e2a\u5217\uff0c\u5168\u90e8\u76f8\u7b49,\u8fd9\u65f6\u5019\u5c31\u8ba4\u4e3a\u662f\u91cd\u590d\u7684\u6570\u636e\u3002<\/p>\n<\/blockquote>\n\n\n\n
                      -- \u8fd4\u56de\u6240\u6709\u7684 class\nselect class from student_t;\n\n-- \u8fd4\u56de\u4e0d\u91cd\u590d\u7684 class\nselect distinct class from student_t;\n\n\n-- \u8fd4\u56de\u6240\u6709\u53bb\u91cd\u540e\u7684\u82f1\u8bed\u6210\u7ee9\n-- 6\u6761\nselect distinct english from student_t;\n\n-- \u8fd4\u56de\u4e24\u5217 \u82f1\u8bed\u548c\u6570\u5b66\u53bb\u91cd\u540e\u7684\u7ed3\u679c\u3002\n-- 10\u6761\nselect distinct english,math from student_t;\n\n-- 13\u6761\n-- 90.90 \u91cd\u590d\u4e86\u4e00\u6761\n-- 90,80 \u91cd\u590d\u4e86\u4e24\u6761\nselect english,math from student_t;<\/code><\/pre>\n\n\n\n
                      limit => \u9650\u5236\u7ed3\u679c\u96c6<\/h3>\n\n\n\n
                      \u4e00\u822c\u7528\u6765\u505a\uff0c\u6bd4\u5982\u9650\u5236\u6700\u5927\u7684\u8fd4\u56de\u6570\u76ee\u3002\u6216\u8005\u662f\u505a\u5206\u9875\u4e0a\u9762\u3002<\/p>\n\n\n\n
                      select * from student_t limit 10;<\/p>\n\n\n\n
                      SELECT <\u67e5\u8be2\u5185\u5bb9|\u5217\u7b49> FROM  <\u8868\u540d\u5b57> LIMIT \u8bb0\u5f55\u6570\u76ee;\nSELECT <\u67e5\u8be2\u5185\u5bb9|\u5217\u7b49> FROM  <\u8868\u540d\u5b57> LIMIT \u521d\u59cb\u4f4d\u7f6e\uff0c\u8bb0\u5f55\u6570\u76ee;\nSELECT <\u67e5\u8be2\u5185\u5bb9|\u5217\u7b49> FROM  <\u8868\u540d\u5b57> LIMIT \u8bb0\u5f55\u6570\u76ee OFFSET \u521d\u59cb\u4f4d\u7f6e;\n\neg:\n-- \u9650\u5236\u6570\u76ee \u4e3anumber\u4e2a\n-- \u9650\u5236\u6700\u5927\u8fd4\u56denumber\u4e2a\uff0c\u5982\u679c\u8868\u4e2d\u8bb0\u5f55\u4e0d\u8db3number\u4e2a\uff0c\u53ea\u4f1a\u8fd4\u56de\u8868\u4e2d\u7684\u8bb0\u5f55\u6570\u3002\nselect * from <\u8868\u540d> where condition limit [\u9650\u5236\u91cf];\n\n-- \u504f\u79fb\u91cf\u4e3aoffsetNumber \u4ece0\u5f00\u59cb\nselect * from <\u8868\u540d> where condition limit [\u504f\u79fb\u91cf], [\u9650\u5236\u91cf];\n\n-- \u504f\u79fb\u91cfoffsetNumber\nselect * from tableName where condition limit number offset offsetNumber;<\/code><\/pre>\n\n\n\n
                      \n
                      \u4f7f\u7528LIMIT<\/code>\u5bf9\u6570\u636e\u8868\u67e5\u8be2\u7ed3\u679c\u96c6\u5927\u5c0f\u8fdb\u884c\u9650\u5b9a.<\/p>\n<\/blockquote>\n\n\n\n
                      \n
                      LIMIT \u8bb0\u5f55\u6570\u76ee: \u4ece\u7b2c\u4e00\u6761\u5f00\u59cb, \u9650\u5b9a\u8bb0\u5f55\u6570\u76ee<\/p>\n<\/blockquote>\n\n\n\n
                      \n
                      LIMIT \u521d\u59cb\u4f4d\u7f6e\uff0c\u8bb0\u5f55\u6570\u76ee: \u4ece\u8d77\u59cb\u4f4d\u7f6e\u5f00\u59cb, \u9650\u5b9a\u8bb0\u5f55\u6570\u76ee<\/p>\n<\/blockquote>\n\n\n\n
                      \n
                      LIMIT \u8bb0\u5f55\u6570\u76ee OFFSET \u521d\u59cb\u4f4d\u7f6e: \u4ece\u8d77\u59cb\u4f4d\u7f6e\u5f00\u59cb, \u9650\u5b9a\u8bb0\u5f55\u6570\u76ee<\/p>\n<\/blockquote>\n\n\n\n
                      \n
                      \u6ce8\u610f: \u6570\u636e(\u9ed8\u8ba4\u4e0b\u6807\u4ece0\u5f00\u59cb)<\/p>\n<\/blockquote>\n\n\n\n
                      -- \u4ece\u7b2c\u4e00\u6761\u5f00\u59cb\u62ff \nselect * from student_t limit 5;\n\n-- limit offsetNumer,number \u504f\u79fb\u6570\u76ee\uff0c\u9700\u8981\u9650\u5236\u7684\u603b\u6570\n-- 2,5 \u4ee3\u8868\u4ece\u7b2c\u4e09\u4e2a\u5f00\u59cb\u62ff \u603b\u5171\u62ff\u56de\u67655\u4e2a\nselect * from student_t limit 2,5;\n\n-- limit number offset offsetNumber\n-- limit 5 offset 3 \u4ee3\u8868 \u4ece\u7b2c\u56db\u4e2a\u5f00\u59cb\u62ff\uff0c\u603b\u5171\u6700\u5927\u62ff\u56de\u6765\u4e94\u4e2a\nselect * from student_t limit 5 offset 3;\n<\/code><\/pre>\n\n\n\n
                      \u4e00\u822c\u7528\u5b83\u6765\u505a\u5206\u9875\u67e5\u8be2\u3002<\/strong><\/p>\n\n\n\n
                      as => \u522b\u540d<\/h3>\n\n\n\n
                      <\u5185\u5bb9> AS <\u522b\u540d><\/code><\/pre>\n\n\n\n
                      \n
                      AS<\/code> \u5173\u952e\u5b57\u7528\u6765\u4e3a\u8868\u548c\u5b57\u6bb5\u6307\u5b9a\u522b\u540d.<\/p>\n<\/blockquote>\n\n\n\n
                      -- \u53ef\u4ee5\u4e3a\u53d6\u51fa\u6765\u7684\u5217\u540d \u53d6\u4e00\u4e2a\u522b\u540d\nselect id,name as student_name,class from student_t;\n\n-- \u53ef\u4ee5\u4e3a\u4e00\u4e9b\u8ba1\u7b97\u7684\u5c5e\u6027\u53d6\u522b\u540d\nselect (chinese + english + math) as total_score from student_t;\n\n-- \u4e5f\u53ef\u4ee5\u4e3a\u8868\u540d\u53d6\u522b\u540d\nselect s.name from student_t as s;\n\nselect s.name from student_t s;\n\n-- as \u53ef\u4ee5\u7701\u7565<\/code><\/pre>\n\n\n\n
                      as\u7ed9\u5b57\u6bb5\u540d\u53d6\u522b\u540d\u5176\u5b9e\u662f\u4e3a\u4e86\u4fee\u6539\u7ed3\u679c\u96c6\u4e2d\u7684\u5217\u540d \u2192 \u5728\u540e\u9762JDBC\u5185\u5bb9\u4e2d\u4e5f\u4f1a\u4f7f\u7528\u5230<\/p>\n\n\n\n
                      as\u7ed9\u8868\u540d\u53d6\u522b\u540d\u5728\u540e\u9762\u591a\u8868\u67e5\u8be2\u4e2d\u4f1a\u4f7f\u7528\uff0c\u4e3b\u8981\u662f\u4e3a\u4e86\u5199SQL\u7684\u65f6\u5019\u5077\u61d2<\/p>\n\n\n\n
                      \u7b80\u800c\u8a00\u4e4b\uff0c\u4e3b\u8981\u573a\u666f\u662f\u591a\u8868\u67e5\u8be2<\/code><\/p>\n\n\n\n
                      order by => \u6392\u5e8f<\/h3>\n\n\n\n
                      \u6bd4\u5982\u6211\u4eec\u60f3\u6839\u636eid\u8fdb\u884c\u6392\u5e8f\uff1b \u6216\u8005\u60f3\u6839\u636e\u5e74\u9f84\u8fdb\u884c\u6392\u5e8f\u3002<\/p>\n\n\n\n
                      SELECT <\u67e5\u8be2\u5185\u5bb9|\u5217\u7b49> FROM  <\u8868\u540d\u5b57> ORDER BY <\u5b57\u6bb5\u540d> [ASC|DESC];<\/code><\/pre>\n\n\n\n
                      \n
                      ORDER BY<\/code>\u5bf9\u67e5\u8be2\u6570\u636e\u7ed3\u679c\u96c6\u8fdb\u884c\u6392\u5e8f.<\/p>\n<\/blockquote>\n\n\n\n
                      \n
                      \u4e0d\u52a0\u6392\u5e8f\u6a21\u5f0f: \u5347\u5e8f\u6392\u5e8f.<\/p>\n<\/blockquote>\n\n\n\n
                      \n
                      ASC: \u5347\u5e8f\u6392\u5e8f.<\/p>\n<\/blockquote>\n\n\n\n
                      \n
                      DESC: \u964d\u5e8f\u6392\u5e8f.<\/p>\n<\/blockquote>\n\n\n\n
                      \n
                      \u6ce8\u610f: \u5982\u4e0a\u67e5\u8be2, \u5f53\u6211\u4eec\u8fdb\u884c\u591a\u5b57\u6bb5\u6392\u5e8f\u7684\u65f6\u5019, \u4f1a\u5148\u6ee1\u8db3\u7b2c\u4e00\u4e2a\u5217\u7684\u6392\u5e8f\u8981\u6c42, \u5982\u679c\u7b2c\u4e00\u5217\u4e00\u81f4\u7684\u8bdd, \u518d\u6309\u7167\u7b2c\u4e8c\u5217\u8fdb\u884c\u6392\u5e8f, \u4ee5\u6b64\u7c7b\u63a8.<\/p>\n<\/blockquote>\n\n\n\n
                      \u4e1a\u52a1\u4e3e\u4f8b\uff1a\u6309\u7167\u4ef7\u683c\u6392\u5e8f\uff0c\u6309\u7167\u9500\u91cf\u6392\u5e8f\uff0c\u6309\u7167\u65f6\u95f4\u6392\u5e8f\uff08\u6700\u8fd1\u53d1\u5e03\u7684\u4ea7\u54c1\uff09<\/strong><\/p>\n\n\n\n
                      group by => \u5206\u7ec4\u805a\u5408<\/h3>\n\n\n\n
                      \u6309\u7167\u67d0\u4e2a\u3001\u67d0\u4e9b\u5b57\u6bb5\u5206\u7ec4\u3002<\/p>\n\n\n\n
                      \u6bd4\u5982\u60f3\u770b\u4e00\u4e2a\u73ed\u7ea7\u6709\u591a\u5c11\u5b66\u751f\u3002\u73ed\u7ea7\u7684\u6700\u9ad8\u5206\uff0c\u6700\u4f4e\u5206\u3002<\/p>\n\n\n\n
                      SELECT <\u67e5\u8be2\u5185\u5bb9|\u5217\u7b49> FROM  <\u8868\u540d\u5b57> GROUP BY  <\u5b57\u6bb5\u540d...>\n\neg: \nselect class from student_t group by class;\nselect class,chinese from student_t group by class, chinese;\nselect class, group_concat(name), group_concat(chinese) from student_t group by class;\n\n-- \u83b7\u53d6\u8bed\u6587\u6210\u7ee9\u5927\u4e8e90\u5206\u7684\uff0c\u6309\u7167\u73ed\u7ea7\u5206\u7ec4\nselect class, group_concat(name) from student_t where chinese > 90 group by class;\n\n-- \u83b7\u53d6\u73ed\u7ea7\u7684\u5e73\u5747\u5206\nselect class, group_concat(name), avg(chinese) from student_t group by class;\n\n-- \u83b7\u53d6\u73ed\u7ea7\u4eba\u6570\u5927\u4e8e\u4e09\u4e2a\u4eba\u7684\u73ed\u7ea7\nselect class, group_concat(name) from student_t group by class having count(*) > 3;\n\n-- \u83b7\u53d6\u73ed\u7ea7\u5e73\u5747\u8bed\u6587\u6210\u7ee9\u5927\u4e8e60\u5206\u7684\nselect class, group_concat(name), avg(chinese) from student_t group by class having avg(chinese) > 60;<\/code><\/pre>\n\n\n\n
                      \n
                      GROUP_CONCAT()\u51fd\u6570\u4f1a\u628a\u6bcf\u4e2a\u5206\u7ec4\u7684\u5b57\u6bb5\u503c\u90fd\u62fc\u63a5\u663e\u793a\u51fa\u6765.<\/p>\n<\/blockquote>\n\n\n\n
                      \n
                      HAVING \u53ef\u4ee5\u8ba9\u6211\u4eec\u5bf9\u5206\u7ec4\u540e\u7684\u5404\u7ec4\u6570\u636e\u8fc7\u6ee4\u3002(\u4e00\u822c\u548c\u5206\u7ec4+\u805a\u5408\u51fd\u6570\u914d\u5408\u4f7f\u7528)<\/p>\n<\/blockquote>\n\n\n\n
                      having\u6ce8\u610f\u548cwhere\u7684\u533a\u522b<\/strong><\/p>\n\n\n\n
                      where\u4e3b\u8981\u7528\u4e8e\u5bf9\u539f\u59cb\u8868\u8fdb\u884c\u8fc7\u6ee4\u3002having\u662f\u5bf9group by \u540e\u7684\u7ed3\u679c\u8fdb\u884c\u8fc7\u6ee4\uff0c\u4e00\u822c\u914d\u5408\u805a\u5408\u51fd\u6570\u4e00\u8d77\u4f7f\u7528\u3002<\/p>\n\n\n\n
                      \u6ce8\u610f\u70b9\uff1a<\/strong><\/p>\n\n\n\n
                        \n
                      • group by<\/code>\u7684select\u5217\u4e2d\uff0c\u53ea\u80fd\u6709\u4e24\u79cd\uff0c1.\u5728group\u4e2d\u51fa\u73b0\u7684\u5b57\u6bb5<\/code>\uff0c2.\u805a\u5408\u51fd\u6570\u805a\u5408\u8d77\u6765\u7684\u4e1c\u897f<\/code><\/li>\n\n\n\n
                      • \u591a\u4e2a\u5b57\u6bb5\u5206\u7ec4\u67e5\u8be2\u65f6\uff0c\u4f1a\u5148\u6309\u7167\u7b2c\u4e00\u4e2a\u5b57\u6bb5\u8fdb\u884c\u5206\u7ec4\u3002\u5982\u679c\u7b2c\u4e00\u4e2a\u5b57\u6bb5\u4e2d\u6709\u76f8\u540c\u7684\u503c\uff0cMySQL \u624d\u4f1a\u6309\u7167\u7b2c\u4e8c\u4e2a\u5b57\u6bb5\u8fdb\u884c\u5206\u7ec4\u3002\u5982\u679c\u7b2c\u4e00\u4e2a\u5b57\u6bb5\u4e2d\u7684\u6570\u636e\u90fd\u662f\u552f\u4e00\u7684\uff0c\u90a3\u4e48 MySQL \u5c06\u4e0d\u518d\u5bf9\u7b2c\u4e8c\u4e2a\u5b57\u6bb5\u8fdb\u884c\u5206\u7ec4.<\/li>\n\n\n\n
                      • \u5982\u679c\u5728select \u5b57\u6bb5\u4e2d\uff0c\u53ef\u4ee5\u770b\u51fagroup \u5b57\u6bb5\uff0c\u540e\u65b9\u53ef\u4ee5\u4f7f\u7528\u6570\u5b57\u4ee3\u66ff\uff0c\u4ece1\u5f00\u59cb<\/li>\n<\/ul>\n\n\n\n
                        -- \u4f1a\u62a5\u9519\u3002\u5982\u679c\u6709\u540c\u5b66\u4e0d\u62a5\u9519\uff0c\u662f\u56e0\u4e3a\u6709\u4e00\u4e2a\u9009\u9879\u6ca1\u5f00\n-- select * from student_t group by class;\n-- select id,class from student_t group by class;\n\n-- \u5728select\u4e2d\u51fa\u73b0\u7684\uff0c\u53ea\u80fd\u6709 group by \u540e\u7684\u5b57\u6bb5\uff1b\u6216\u8005\u662f\u805a\u5408\u51fd\u6570\u805a\u5408\u8d77\u6765\u7684\u4e1c\u897f\nselect class from student_t group by class;\n\n-- \u6839\u636e\u82f1\u8bed\u6210\u7ee9\u8fdb\u884c\u5206\u7ec4\nselect english from student_t group by 1;\n\n-- \u6839\u636e\u82f1\u8bed\u6210\u7ee9\uff0c\u6570\u5b66\u6210\u7ee9\u8fdb\u884c\u5206\u7ec4\n-- \u4f1a\u5148\u6309\u7167\u82f1\u8bed\u6210\u7ee9\u5206\u7ec4\uff0c\u5982\u679c\u82f1\u8bed\u6210\u7ee9\u76f8\u540c\uff0c\u5219\u6309\u7167\u6570\u5b66\u6210\u7ee9\u8fdb\u884c\u5206\u7ec4\nselect english,math from student_t group by english,math;\n<\/code><\/pre>\n\n\n\n
                        \u805a\u5408\u51fd\u6570<\/h3>\n\n\n\n
                        \u805a\u5408\u51fd\u6570\u4e00\u822c\u7528\u6765\u8ba1\u7b97\u5217\u76f8\u5173\u7684\u6307\u5b9a\u503c. \u901a\u5e38<\/code>\u548c\u805a\u5408<\/code>\u4e00\u8d77\u4f7f\u7528<\/p>\n\n\n\n
                        \u51fd\u6570<\/th>\u4f5c\u7528<\/th>\u51fd\u6570<\/th>\u4f5c\u7528<\/th><\/tr><\/thead>
                        COUNT<\/td>\u8ba1\u6570<\/td>SUM<\/td>\u548c<\/td><\/tr>
                        AVG<\/td>\u5e73\u5747\u503c<\/td>MAX<\/td>\u6700\u5927\u503c<\/td><\/tr>
                        MIN<\/td>\u6700\u5c0f\u503c<\/td><\/td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
                        SELECT <\u67e5\u8be2\u5185\u5bb9>|\u5217\u7b49 , (\u805a\u5408\u51fd\u6570)|* FROM  <\u8868\u540d\u5b57> GROUP BY  <\u5217\u7b49> HAVING (\u805a\u5408\u51fd\u6570)\u6761\u4ef6 |\u6761\u4ef6;<\/code><\/pre>\n\n\n\n
                        \u5176\u4e2dHAVING\u662f\u7528\u6765\u505a\u62fc\u63a5\u805a\u5408\u503c\u6761\u4ef6<\/p>\n\n\n\n
                        COUNT: \u8ba1\u6570<\/strong><\/p>\n\n\n\n
                        select count(<\u5217>) from tableName [where \u6761\u4ef6];\n\n-- eg:\nselect count(*) from student_t;\nselect count(name) from student_t;\n\n-- \u548c\u5206\u7ec4\u4e00\u8d77\u4f7f\u7528\u3002\u67e5\u770b\u6bcf\u4e2a\u73ed\u7ea7\u6709\u591a\u5c11\u4eba\u6570\n\nselect class,count(*) from student_tgroup by class;\n<\/code><\/pre>\n\n\n\n
                        \n
                        COUNT(*)<\/code>:\u8868\u793a\u8868\u4e2d\u603b\u884c\u6570<\/p>\n<\/blockquote>\n\n\n\n
                        \n
                        <\/p>\n<\/blockquote>\n\n\n\n
                        \n
                        COUNT(\u5217)<\/code>: \u8ba1\u7b97\u975eNULL\u7684\u603b\u884c\u6570\u3002\u7edf\u8ba1\u8fd9\u4e2a\u7ec4\uff0c\u8fd9\u4e00\u5217\u975enull\u7684\u603b\u884c\u6570\u3002<\/p>\n<\/blockquote>\n\n\n\n
                        SUM: \u6c42\u548c<\/strong><\/p>\n\n\n\n
                        SELECT <\u67e5\u8be2\u5185\u5bb9>|\u5217\u7b49 , SUM<\u5217> FROM  <\u8868\u540d\u5b57> GROUP BY <\u5217\u7b49> HAVING SUM<\u8868\u8fbe\u5f0f>|\u6761\u4ef6\n  \n-- eg:\nselect sum(chinese) from student_t;\nselect sum(chinese), sum(english), sum(math) from student_t;\n  \n-- \u67e5\u770b\u6bcf\u4e2a\u73ed\u7ea7\u7684\u8bed\u6587\u603b\u5206\nselect class,sum(chinese),group_concat(chinese) from student_tgroup by class;<\/code><\/pre>\n\n\n\n
                        AVG: \u5e73\u5747\u503c<\/strong><\/p>\n\n\n\n
                        SELECT <\u67e5\u8be2\u5185\u5bb9>|\u5217\u7b49 , AVG<\u5217> FROM  <\u8868\u540d\u5b57> GROUP BY  <\u5217\u7b49> HAVING AVG<\u8868\u8fbe\u5f0f>|\u6761\u4ef6\n\n-- eg:\nselect avg(chinese) from student_t;\nselect avg(chinese), avg(english), avg(math) from student_t;\n    \n-- \u6309\u73ed\u7ea7\u67e5\u770b\u5e73\u5747\u5206\nselect class,avg(chinese), avg(english), avg(math) from student_tgroup by 1;<\/code><\/pre>\n\n\n\n
                        MAX: \u6700\u5927\u503c<\/strong><\/p>\n\n\n\n
                        SELECT <\u67e5\u8be2\u5185\u5bb9>|\u5217\u7b49 , MAX(<\u5217>) FROM  <\u8868\u540d\u5b57> GROUP BY <\u5217\u7b49> HAVING MAX(<\u8868\u8fbe\u5f0f>)|\u6761\u4ef6\n\n-- eg: \nselect max(chinese) from student_t;\nselect max(chinese), max(english), max(math) from student_t;<\/code><\/pre>\n\n\n\n
                        MIN: \u6700\u5c0f\u503c<\/strong><\/p>\n\n\n\n
                        SELECT <\u67e5\u8be2\u5185\u5bb9>|\u5217\u7b49 , MIN(<\u5217>) FROM  <\u8868\u540d\u5b57> GROUP BY  <\u5217\u7b49> HAVING MIN(<\u8868\u8fbe\u5f0f>)|\u6761\u4ef6

                        -- eg:
                        select min(chinese) from student_t;
                        select min(chinese), min(english), max(math) from student_t;


                        -- \u67e5\u8be2\u6bcf\u4e2a\u540c\u5b66\u7684\u603b\u6210\u7ee9\uff0c\u5e73\u5747\u6210\u7ee9\uff0c\u5e76\u7528\u522b\u540d\u8868\u793a\uff1b
                        -- ROUND(100.3465,2) \u56db\u820d\u4e94\u5165
                        select name, (chinese + english + math) as total_score, ((chinese + english + math)\/3) as avg_score from student_t;

                        select name, (chinese + math + english) as total_score , round((chinese+math+english) \/3, 2) as avg_score from student_t;

                        -- \u67e5\u8be2\u6570\u5b66\u6700\u5927\u503c\uff0c\u5e76\u7528\u522b\u540d\u8868\u793a\uff1b
                        select max(math) as max_math_score from student_t;

                        -- \u67e5\u8be2\u5916\u8bed\u6700\u5c0f\u503c\uff0c\u5e76\u7528\u522b\u540d\u8868\u793a\uff1b
                        select min(english) as min_english_score from student_t;

                        -- \u67e5\u8be2\u5168\u4f53\u5b66\u751f\u7684\u8bed\u6570\u5916\u5404\u79d1\u5e73\u5747\u6210\u7ee9\uff0c\u5e76\u7528\u522b\u540d\u8868\u793a\uff1b
                        select avg(chinese),avg(math),avg(english) as avg_english from student_t;
                        <\/code><\/pre>\n\n\n\n
                        \u589e\u52a0\u4e0aHaving\u5bf9\u805a\u5408\u7ed3\u679c\u8fdb\u884c\u7b5b\u9009<\/p>\n\n\n\n
                        SELECT <\u67e5\u8be2\u5185\u5bb9>|\u5217\u7b49 , (\u805a\u5408\u51fd\u6570)|* FROM  <\u8868\u540d\u5b57> GROUP BY  <\u5217\u7b49> HAVING (\u805a\u5408\u51fd\u6570)\u6761\u4ef6 |\u6761\u4ef6;\n\n-- eg:\nselect class, group_concat(name), count(*) from student_t group by class;\nselect class, group_concat(name), count(*) from student_t group by class having count(*) > 3;  \n    \n\n-- \u83b7\u53d6\u8bed\u6587\u6210\u7ee9\u5927\u4e8e90\u5206\u7684\uff0c\u6309\u7167\u73ed\u7ea7\u5206\u7ec4\n\n-- \u83b7\u53d6\u73ed\u7ea7\u7684\u5e73\u5747\u5206\n\n-- \u83b7\u53d6\u73ed\u7ea7\u4eba\u6570\u5927\u4e8e\u4e09\u4e2a\u4eba\u7684\u73ed\u7ea7\n\n-- \u83b7\u53d6\u73ed\u7ea7\u5e73\u5747\u8bed\u6587\u6210\u7ee9\u5927\u4e8e60\u5206\u7684\n\n-- \u67e5\u8be2\u73ed\u7ea7\u8bed\u6587\u603b\u5206\u5927\u4e8e200\u7684\u73ed\u7ea7(\u53ef\u4ee5\u663e\u793a\u4e00\u4e0b\u8bed\u6587\u603b\u5206)\n\n-- \u67e5\u8be2\u73ed\u7ea7\u5e73\u5747\u5206\uff0c\u5b66\u751f\u7684\u9650\u5236\uff1a\u6570\u5b66\u5927\u4e8e\u7b49\u4e8e60\uff0c\u8bed\u6587\u5927\u4e8e\u7b49\u4e8e60\u7684 \n\n-- \u67e5\u8be2\u73ed\u7ea7\u60c5\u51b5\uff0c\u8981\u6c42\u5b66\u751f\u8bed\u6587\u6700\u5927\u7684\u5927\u4e8e\u7b49\u4e8e90\uff0c\u8bed\u6587\u6700\u5c11\u5206\u5927\u4e8e\u7b49\u4e8e70\n\n-- \u67e5\u8be2\u73ed\u7ea7\uff0c\u8bed\u6587\u6700\u5c0f\u6210\u7ee9\u5927\u4e8e\u7b49\u4e8e60\uff0c\u6570\u5b66\u4e5f\u662f\n\nselect class from student_t group by class having sum(chinese) > 200;<\/code><\/pre>\n\n\n\n
                        SQL\u6267\u884c\u987a\u5e8f<\/h2>\n\n\n\n
                         (5) SELECT <\u5217\u540d>, ...   \n (1) FROM <\u8868\u540d>, ...   \n (2) [WHERE ...]   \n (3) [GROUP BY ...]   \n (4) [HAVING ...]   \n (6) [ORDER BY ...];  \n (7) [Limit ...]<\/code><\/pre>\n\n\n\n
                        \n
                        – \u5c0f\u62ec\u53f7\u4e2d\u7684\u6570\u5b57\u4ee3\u8868\u6267\u884c\u987a\u5e8f<\/p>\n<\/blockquote>\n\n\n\n
                        \n
                        – SQL\u8bed\u53e5\u7684\u5173\u952e\u5b57\u662f\u6709\u987a\u5e8f\u7684\uff0c\u9700\u8981\u6309\u7167\u4e0a\u9762\u7684\u987a\u5e8f\u6765\u5199<\/p>\n<\/blockquote>\n\n\n\n
                        \n
                        – \u8981\u6ce8\u610f\u4e66\u5199\u987a\u5e8f\u3002\u4e5f\u8981\u6ce8\u610f\u6267\u884c\u987a\u5e8f\u3002<\/p>\n\n\n\n
                        \"\"<\/div><\/figure>\n<\/blockquote>\n\n\n\n
                        \u6570\u636e\u5b8c\u6574\u6027<\/h2>\n\n\n\n
                        \u4e3b\u8981\u662f\u7528\u6765\u9650\u5236MySQL\u8868\u4e2d\u7684\u6570\u636e\uff0c\u4f7f\u6570\u636e\u7b26\u5408\u89c4\u8303\uff0c\u4e5f\u79f0\u4e4b\u4e3a\u5b8c\u6574\u3002<\/p>\n\n\n\n
                        \u6bd4\u5982\uff0c\u4f60\u73b0\u5728\uff0c\u5199\u4e86\u4e00\u4e2a\u7528\u6237\u8868\u3002\u5e0c\u671b\u7528\u6237\u8868\u91cc\u9762\u7684name\u8fd9\u4e00\u5217\uff0c\u5168\u90e8\u90fd\u5e94\u8be5\u6709\u6570\u636e\u3002 \u6709\u65f6\u5019\uff0c\u5982\u679c\u4e0d\u52a0\u4ee5\u9650\u5236\uff0c\u90a3\u4f1a\u88ab\u63d2\u5165\u4e00\u4e9b\u65e0\u610f\u4e49\u7684\u503c\u3002<\/p>\n\n\n\n
                        \u5927\u5bb6\u53ef\u4ee5\u7406\u89e3\u4e3a\u8fd9\u662f\u4e00\u79cd\u7ea6\u675f\uff0c\u4e00\u79cd\u9650\u5236<\/strong><\/p>\n\n\n\n
                        \u8fd9\u4e2a\u4e3b\u8981\u662f\u5728\u8bbe\u8ba1\u8868\u4ee5\u53ca\u5b57\u6bb5<\/code>\u7684\u8fc7\u7a0b\u4e2d\u53ef\u4ee5\u63d0\u524d\u8003\u8651\u4e00\u4e0b<\/p>\n\n\n\n
                        \u5b9e\u4f53\u5b8c\u6574\u6027<\/h3>\n\n\n\n
                        \u7f3a\u5c11\u4e86\u8fd9\u4e2a\u5b57\u6bb5\uff0c\u5b9e\u4f53\u5c31\u4e0d\u5b8c\u6574\u3002<\/p>\n\n\n\n
                        \u5217\u7ea6\u675f<\/p>\n\n\n\n
                        \n
                        MySQL\u53ef\u4ee5\u5bf9\u63d2\u5165\u7684\u6570\u636e\u8fdb\u884c\u7279\u5b9a\u7684\u9a8c\u8bc1\uff0c\u53ea\u6709\u6ee1\u8db3\u6761\u4ef6\u624d\u53ef\u4ee5\u63d2\u5165\u5230\u6570\u636e\u8868\u4e2d\uff0c\u5426\u5219\u8ba4\u4e3a\u662f\u975e\u6cd5\u63d2\u5165<\/p>\n<\/blockquote>\n\n\n\n
                        \u4e3b\u952e(primary key)<\/strong><\/p>\n\n\n\n
                          \n
                        • \u4e00\u4e2a\u8868\u53ea\u80fd\u6709\u4e00\u4e2a\u4e3b\u952e<\/li>\n\n\n\n
                        • \u4e3b\u952e\u5177\u6709\u552f\u4e00\u6027<\/strong><\/li>\n\n\n\n
                        • \u4e3b\u952e\u5b57\u6bb5\u7684\u503c\u4e0d\u80fd\u4e3anull<\/strong><\/li>\n\n\n\n
                        • \u58f0\u660e\u5b57\u6bb5\u65f6\uff0c\u7528 primary key \u6807\u8bc6<\/li>\n\n\n\n
                        • \u4e3b\u952e\u53ef\u4ee5\u7531\u591a\u4e2a\u5b57\u6bb5\u5171\u540c\u7ec4\u6210\u3002\u6b64\u65f6\u9700\u8981\u5728\u5b57\u6bb5\u5217\u8868\u540e\u58f0\u660e\u7684\u65b9\u6cd5<\/li>\n<\/ul>\n\n\n\n
                          create table test_primary_key(\n    -- \u4ee3\u8868\u8fd9\u4e2a columnName\u662f\u4e3b\u952e\n\tcolumnName columnType primary key,\n\t......\n)\n\ncreate table test_primary_key2(\n\tcolumnName columnType,\n\t......,\n\tprimary key(columnName\uff0c columnName2)\n)<\/code><\/pre>\n\n\n\n
                          auto_increment \u81ea\u52a8\u589e\u957f\u7ea6\u675f<\/strong><\/p>\n\n\n\n
                          \u4e00\u4e9b\u5e8f\u53f7\uff0c\u6ca1\u6709\u5fc5\u987b\u624b\u52a8\u751f\u6210\uff0c\u60f3\u8ba9mysql\u81ea\u52a8\u751f\u6210\u3002<\/p>\n\n\n\n
                            \n
                          • \u81ea\u52a8\u589e\u957f\u5fc5\u987b\u4e3a\u7d22\u5f15(\u4e3b\u952e\u6216unique)<\/li>\n\n\n\n
                          • \u53ea\u80fd\u5b58\u5728\u4e00\u4e2a\u5b57\u6bb5\u4e3a\u81ea\u52a8\u589e\u957f\u3002<\/li>\n\n\n\n
                          • \u9ed8\u8ba4\u4e3a1\u5f00\u59cb\u81ea\u52a8\u589e\u957f\u3002<\/li>\n<\/ul>\n\n\n\n
                            create table test_auto_increment(\n\tcolumnName columnType primary key auto_increment,\n\t......\n)<\/code><\/pre>\n\n\n\n
                            create table stu(  \n   id int PRIMARY KEY auto_increment,  \n   name varchar(20),  \n   age int,  \n   class varchar(20)  \n ) auto_increment=1000 ;<\/code><\/pre>\n\n\n\n
                            \u5728\u4e0a\u8868\u4e2d\uff0cid\u662f\u4e3b\u952e\uff0c\u662f\u81ea\u589e\u7684\u3002\u4e3b\u952e\u503c\u4ece1000\u5f00\u59cb\u81ea\u589e\uff0c\u901a\u8fc7auto_increment\u6765\u6307\u5b9a\uff0c\u5047\u5982\u6ca1\u6709\u6307\u5b9a\uff0c\u4ece1\u5f00\u59cb\u81ea\u589e<\/p>\n\n\n\n
                            -- \u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4e00\u6761\u547d\u4ee4\u53bb\u770b  \u81ea\u52a8\u589e\u957f\u76ee\u524d\u589e\u957f\u5230\u54ea\nshow create table table_name;<\/code><\/pre>\n\n\n\n
                            \u57df\u5b8c\u6574\u6027<\/h3>\n\n\n\n
                            \u57df\u5b8c\u6574\u6027\u662f\u9488\u5bf9\u67d0\u4e00\u5177\u4f53\u5173\u7cfb\u6570\u636e\u5e93\u7684\u7ea6\u675f\u6761\u4ef6\uff0c\u5b83\u4fdd\u8bc1\u8868\u4e2d\u67d0\u4e9b\u5217\u4e0d\u80fd\u8f93\u5165\u65e0\u6548\u7684\u503c\u3002<\/strong><\/p>\n\n\n\n
                            \u6bd4\u5982\u8fd9\u4e2a\u4eba\u7684\u59d3\u540d\uff0c\u4e0d\u5141\u8bb8\u8f93\u5165null\u8fd9\u79cd\u503c\u3002<\/p>\n\n\n\n
                            \u6bd4\u5982\u6709\u4e00\u5f20\u5b66\u751f\u8868\u3002 id name id_card\u3002\u4e0d\u5e0c\u671b\u8fd9\u4e2aid_card\u6709\u4efb\u4f55\u7684null\u8f93\u5165\u503c\u3002<\/p>\n\n\n\n
                            null\u7ea6\u675f<\/strong><\/p>\n\n\n\n
                              \n
                            • null\u4e0d\u662f\u6570\u636e\u7c7b\u578b\uff0c\u662f\u5217\u7684\u4e00\u4e2a\u5c5e\u6027\u3002\u4e00\u4e2a\u5177\u4f53\u7684\u503c<\/li>\n\n\n\n
                            • \u8868\u793a\u5f53\u524d\u5217\u662f\u5426\u53ef\u4ee5\u4e3anull\uff0c\u8868\u793a\u4ec0\u4e48\u90fd\u6ca1\u6709<\/li>\n\n\n\n
                            • null, \u5141\u8bb8\u4e3a\u7a7a\u3002\u9ed8\u8ba4<\/li>\n\n\n\n
                            • not null, \u4e0d\u5141\u8bb8\u4e3a\u7a7a<\/li>\n<\/ul>\n\n\n\n
                              null\u8868\u793a\u6ca1\u6709\u6570\u636e\uff0c\u4f46\u662f\u6ce8\u610fnull\u4e0d\u662f\u7a7a\u5b57\u7b26\u4e32\u3002<\/p>\n\n\n\n
                              create table test_null(\n\tcolumnName columnType not null,\n\tcolumnName2 columnType2 null,\n\t......\n)\n\n-- \u8fd9\u4ee3\u8868null\ninsert into test_null(column1) values (null);\n\n-- \u8fd9\u4e2a\u4e0d\u662fnull\u3002\u8fd9\u662f\u4e00\u4e2a\u666e\u901a\u5b57\u7b26\u4e32\ninsert into test_null(column1) values (\"null\");<\/code><\/pre>\n\n\n\n
                              \u552f\u4e00\u503c\u7ea6\u675f<\/strong><\/p>\n\n\n\n
                                \n
                              • unique<\/li>\n<\/ul>\n\n\n\n
                                \u8868\u793a\u503c\u662f\u552f\u4e00\u7684\uff0c\u4e0d\u91cd\u590d\u7684<\/p>\n\n\n\n
                                create table teacher(\n\tid int PRIMARY KEY,\n\tname varchar(20) unique,\n\tage int not null\n);<\/code><\/pre>\n\n\n\n
                                \n
                                1. \u63d2\u5165\u7684\u503c\u4e0d\u80fd\u91cd\u590d<\/p>\n<\/blockquote>\n\n\n\n
                                \n
                                2. \u53ef\u4ee5\u63d2\u5165null<\/p>\n<\/blockquote>\n\n\n\n
                                \n
                                3. null\u53ef\u4ee5\u91cd\u590d<\/p>\n<\/blockquote>\n\n\n\n
                                unique\u548cprimary key\u7684\u533a\u522b\uff1a<\/p>\n\n\n\n
                                  \n
                                1. \u4e3b\u952e\u503c\u4e0d\u80fd\u4e3a\u7a7a\uff08null\uff09\uff0c\u800cunique\u53ef\u4ee5\u4e3a\u7a7a(null)<\/li>\n\n\n\n
                                2. \u76f8\u540c\u70b9\uff1a \u90fd\u4e0d\u80fd\u63d2\u5165\u91cd\u590d\u7684\u6570\u636e\u3002<\/li>\n<\/ol>\n\n\n\n
                                  \u53c2\u7167\u5b8c\u6574\u6027<\/h3>\n\n\n\n
                                  \u5916\u952e\uff08\u4e86\u89e3\uff09<\/strong>\u662f\u5173\u7cfb\u6570\u636e\u5e93\u4e2d\u4e00\u4e2a\u975e\u5e38\u91cd\u8981\u7684\u6982\u5ff5\uff0c\u7528\u4e8e\u5efa\u7acb\u8868\u4e0e\u8868\u4e4b\u95f4\u7684\u5173\u7cfb\u3002\u4e00\u4e2a\u8868\u4e2d\u7684\u5916\u952e\u6307\u5411\u53e6\u4e00\u4e2a\u8868\u4e2d\u7684\u67d0\u4e2a\u5b57\u6bb5\uff0c\u8fd9\u4e2a\u5b57\u6bb5\u901a\u5e38\u662f\u53e6\u4e00\u4e2a\u8868\u4e2d\u7684\u4e3b\u952e\u3002\u5916\u952e\u7684\u4f5c\u7528\u662f\u4fdd\u969c\u6570\u636e\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\uff0c\u5b83\u53ef\u4ee5\u786e\u4fdd\u4e24\u4e2a\u8868\u4e4b\u95f4\u7684\u5173\u7cfb\u6b63\u786e\u5730\u7ef4\u62a4\uff0c\u9632\u6b62\u6570\u636e\u51fa\u73b0\u4e0d\u4e00\u81f4\u6216\u8005\u4e0d\u5b8c\u6574\u7684\u60c5\u51b5\u3002<\/p>\n\n\n\n
                                  \u5916\u952e\u3002\u5173\u7cfb\u578b\u6570\u636e\u5e93\uff0c\u4e0d\u4ec5\u53ef\u4ee5\u5b58\u50a8\u6570\u636e\uff0c\u8fd8\u53ef\u4ee5\u5b58\u50a8\u6570\u636e\u548c\u6570\u636e\u4e4b\u95f4\u7684\u5173\u7cfb\uff0c\u5177\u4f53\u7684\u4f53\u73b0\u5c31\u662f\u5916\u952e\u3002<\/p>\n\n\n\n
                                  \"\"<\/div><\/figure>\n\n\n\n
                                  create table province(\n\tid int PRIMARY KEY,\n\tname varchar(20)\n);\n\ncreate table city(\n\tid int ,\n\tname varchar(20),\n\tprovince_id int,\n\t-- \u58f0\u660e\u5916\u952e\n    -- CONSTRAINT \u5916\u952e\u540d\u79f0 foreign key(\u5217) references \u8868\u540d(\u5217\u540d)\n    -- \u5728 province_id\u4e0a\u5efa\u7acb\u4e00\u4e2a\u5916\u952e\uff0c\u6307\u5411   province\u8868\u7684id\u5b57\u6bb5\n\tCONSTRAINT fk_pid foreign key(province_id) REFERENCES province(id)\n);\n\n-- \u5916\u952e\u7684\u53e6\u5916\u4e00\u79cd\u5199\u6cd5\n-- foreign key(\u5217) references \u8868\u540d(\u5217\u540d)\n-- foreign key(s_id) references school(id)\n \ninsert into province values(41, \"\u6cb3\u5357\u7701\");\ninsert into province values(43, \"\u6e56\u5357\u7701\");\ninsert into province values(42, \"\u6e56\u5317\u7701\");\n\ninsert into city(id, name, province_id) values(1, \"\u6b66\u6c49\", 42);\ninsert into city(id, name, province_id) values(13, \"\u968f\u5dde\", 42);\ninsert into city(id, name, province_id) values(1, \"\u957f\u6c99\", 43);\ninsert into city(id, name, province_id) values(6, \"\u5cb3\u9633\", 43);\n\n-- \u57ce\u5e02\u8868\u63d2\u5165\n\n-- \u63d2\u5165\u57ce\u5e02\u8868\u7684\u65f6\u5019\u4f1a\u53bb\u5bfb\u627e\u6709\u6ca1\u670923\u5bf9\u5e94\u7684\u7701\u4efd\uff0c\u5982\u679c\u6709\uff0c\u63d2\u5165\n-- \u5982\u679c\u6ca1\u6709\uff0c\u90a3\u4e48\u4f1a\u62a5\u9519\ninsert into city values (6,'\u54c8\u5c14\u6ee8',23);\n\n-- \u4e0d\u80fd\u5220\u9664\u8fd8\u6709\u5b50\u884c\u7684\u6570\u636e\ndelete from province where id = 32;<\/code><\/pre>\n\n\n\n
                                  \u5916\u952e\u7684\u4f18\u7f3a\u70b9\uff1a<\/p>\n\n\n\n
                                    \n
                                  • \u4f18\u70b9\uff1a\u80fd\u591f\u9650\u5236\u6570\u636e\u7684\u589e\u52a0\u3001\u5220\u9664\u6216\u8005\u662f\u4fee\u6539\u64cd\u4f5c\uff0c\u6765\u4fdd\u8bc1\u6570\u636e\u7684\u6b63\u786e\u6027\u3002<\/li>\n\n\n\n
                                  • \u7f3a\u70b9\uff1a<\/li>\n<\/ul>\n\n\n\n
                                      \n
                                    1. \u5728\u63d2\u5165\uff08\u4fee\u6539\uff09\u5b50\u884c\uff08\u57ce\u5e02\u8868\uff09\u7684\u6570\u636e\u7684\u65f6\u5019\uff0c\u9700\u8981\u53bb\u7236\u8868\uff08\u7701\u4efd\u8868\uff09\u4e2d\u627e\u5bf9\u5e94\u7684\u6570\u636e<\/li>\n\n\n\n
                                    2. \u5728\u5220\u9664\uff08\u4fee\u6539\uff09\u7236\u8868\uff08\u7701\u4efd\u8868\uff09\u7684\u6570\u636e\u7684\u65f6\u5019\uff0c\u9700\u8981\u53bb\u68c0\u67e5\u57ce\u5e02\u8868\u4e2d\u662f\u5426\u6709\u5bf9\u5e94\u7684\u6570\u636e<\/li>\n<\/ol>\n\n\n\n
                                      \u603b\u7ed3\uff1a\u6709\u4e86\u5916\u952e\u4e4b\u540e\uff0c\u5f71\u54cd\u4e86\u589e\u52a0\u3001\u5220\u9664\u3001\u4fee\u6539\u7684\u6027\u80fd<\/p>\n\n\n\n
                                      \u5176\u4ed6\u7ea6\u675f\uff08\u5c5e\u6027\uff09<\/p>\n\n\n\n
                                      default \u9ed8\u8ba4\u503c\u5c5e\u6027<\/strong><\/p>\n\n\n\n
                                      \u5f53\u524d\u5b57\u6bb5\u7684\u9ed8\u8ba4\u503c\u3002<\/p>\n\n\n\n
                                      create table test_default(\n\tcolumnName timestamp ,\n\t......\n);\n\ncreate table test_default(\n\tid int primary key,\n    name varchar(200),\n    -- \u5982\u679c\u4f60\u63d2\u5165\u6570\u636e\u7684\u65f6\u5019\uff0c\u6ca1\u6709\u6307\u5b9a\uff0c\u8fd9\u65f6\u5019\u6211\u5c31\u7528\u9ed8\u8ba4\u503c\n    country varchar(200) default \"\u4e2d\u56fd\"\n);\n\n\nCREATE TABLE `user_info`  (\n  id int, \n  name varchar(200)\n  create_time timestamp DEFAULT CURRENT_TIMESTAMP COMMENT '\u521b\u5efa\u65f6\u95f4',\n  update_time timestamp DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '\u66f4\u65b0\u65f6\u95f4'\n);<\/code><\/pre>\n\n\n\n
                                      \n
                                      create table tab ( create_time timestamp default current_timestamp );<\/p>\n<\/blockquote>\n\n\n\n
                                      \n
                                      — \u8868\u793a\u5c06\u5f53\u524d\u65f6\u95f4\u7684\u65f6\u95f4\u6233\u8bbe\u4e3a\u9ed8\u8ba4\u503c\u3002<\/p>\n<\/blockquote>\n\n\n\n
                                      \n
                                      current_date, current_time<\/p>\n<\/blockquote>\n\n\n\n
                                      \n
                                      ON UPDATE CURRENT_TIMESTAMP(0) COMMENT ‘\u66f4\u65b0\u65f6\u95f4’<\/p>\n<\/blockquote>\n\n\n\n
                                      \u8868\u4e2d\uff0c\u4e00\u822c\u4f1a\u6709\u4e09\u4e2a\u5b57\u6bb5\u662f\u56fa\u5b9a\u7684\uff08\u4e5f\u5c31\u662f\u521b\u8868\u5fc5\u987b\u5f97\u6709\uff09\u3002id create_time update_time \u89c1\u963f\u91cc\u7f16\u7a0b\u89c4\u8303 9\u6761\u3002<\/p>\n\n\n\n
                                      comment \u6ce8\u91ca<\/strong><\/p>\n\n\n\n
                                      -- \u4f5c\u7528\u662f\u4ec0\u4e48\uff1f\n-- \u4e3a\u4e86\u8ba9\u4ee3\u7801\u66f4\u597d\u7406\u89e3\u3002\n-- SQL\u91cc\u9762\u7684\u6ce8\u91ca\uff0c\u662f\u4e3a\u4e86\u8ba9SQL\u7684\u5b57\u6bb5\u66f4\u597d\u7406\u89e3\u3002\u5982\u679c\u4f60\u8fdb\u5165\u4e86\u4e00\u4e2a\u516c\u53f8\uff0c\u4e0d\u61c2\u8fd9\u4e2a\u8868\u91cc\u9762\u7684\u5b57\u6bb5\u7684\u542b\u4e49\u3002\n-- \u53ef\u4ee5\u8fd0\u884c\u4e00\u4e0b\u8fd9\u4e2a\u547d\u4ee4\uff0c\u770b\u4e00\u4e0b\u6709\u6ca1\u6709\u5907\u6ce8\u5e2e\u4f60\u66f4\u597d\u7684\u7406\u89e3\u8fd9\u4e2a\u8868\u3002    show create table test_comment;\n\ncreate table test_comment(\n  id int primary key auto_increment,\n  name varchar(255) comment \"\u540d\u5b57\",\n  status int comment \"0\u8868\u793a\u672a\u4ed8\u6b3e\uff0c1\u8868\u793a\u5df2\u4ed8\u6b3e\uff0c2\"\n);\n\n-- \u76f8\u5f53\u4e8e\u662f\u5b57\u6bb5\u7684\u5907\u6ce8\u4fe1\u606f\n-- \u53ef\u4ee5\u4f7f\u7528 show create table test_comment;\u6765\u67e5\u770b\u5907\u6ce8<\/code><\/pre>\n\n\n\n
                                      \u8bf4\u660e<\/h3>\n\n\n\n
                                      \u8fd9\u4e9b\u4e5f\u90fd\u53ef\u4ee5\u5728\u5f00\u53d1\u8fc7\u7a0b\u4e2d\u968f\u7740\u5f00\u53d1\u7684\u9700\u6c42\u8fdb\u884c\u8c03\u6574<\/p>\n\n\n\n
                                      CREATE TABLE `market_admin` (\n  `id` int NOT NULL AUTO_INCREMENT,\n  `username` varchar(63) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL DEFAULT '' COMMENT '\u7ba1\u7406\u5458\u540d\u79f0',\n  `password` varchar(63) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL DEFAULT '' COMMENT '\u7ba1\u7406\u5458\u5bc6\u7801',\n  `last_login_ip` varchar(63) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '' COMMENT '\u6700\u8fd1\u4e00\u6b21\u767b\u5f55IP\u5730\u5740',\n  `last_login_time` datetime DEFAULT NULL COMMENT '\u6700\u8fd1\u4e00\u6b21\u767b\u5f55\u65f6\u95f4',\n  `avatar` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '''' COMMENT '\u5934\u50cf\u56fe\u7247',\n  `add_time` datetime DEFAULT NULL COMMENT '\u521b\u5efa\u65f6\u95f4',\n  `update_time` datetime DEFAULT NULL COMMENT '\u66f4\u65b0\u65f6\u95f4',\n  `deleted` tinyint(1) DEFAULT '0' COMMENT '\u903b\u8f91\u5220\u9664',\n  `role_ids` varchar(127) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT '[]' COMMENT '\u89d2\u8272\u5217\u8868',\n  PRIMARY KEY (`id`) USING BTREE\n) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci ROW_FORMAT=DYNAMIC COMMENT='\u7ba1\u7406\u5458\u8868';<\/code><\/pre>\n\n\n\n
                                      \"\"<\/div><\/figure>\n\n\n\n
                                      \u591a\u8868\u8bbe\u8ba1<\/h2>\n\n\n\n
                                      \u5728\u5173\u7cfb\u578b\u6570\u636e\u5e93\u4e2d\uff0c\u591a\u8868\u8bbe\u8ba1\u662f\u6307\u5c06\u6570\u636e\u5206\u6563\u5230\u591a\u4e2a\u8868\u4e2d\uff0c\u6bcf\u4e2a\u8868\u5b58\u50a8\u4e0d\u540c\u7684\u6570\u636e\u3002\u8fd9\u79cd\u8bbe\u8ba1\u65b9\u5f0f\u53ef\u4ee5\u63d0\u9ad8\u6570\u636e\u5b58\u50a8\u7684\u6548\u7387\u548c\u7075\u6d3b\u6027\uff0c\u540c\u65f6\u4e5f\u53ef\u4ee5\u66f4\u597d\u5730\u4fdd\u969c\u6570\u636e\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002<\/p>\n\n\n\n
                                      \u6709\u5173\u7cfb\u7684\u4e00\u4e9b\u8868\u624d\u9700\u8981\u8fd9\u79cd\u591a\u8868\u8bbe\u8ba1\u3002<\/p>\n\n\n\n
                                      \u5b66\u751f\u8868\u548c\u8ba2\u5355\u8868\u3002 \u5176\u5b9e\u6ca1\u6709\u5173\u7cfb\uff0c\u6240\u4ee5\u5b83\u4eec\u4e0d\u9700\u8981\u591a\u8868\u8bbe\u8ba1\u3002<\/p>\n\n\n\n
                                      \u7528\u6237\u8868\u548c\u7528\u6237\u8be6\u60c5\u8868\u3002 \u8fd9\u4e2a\u6709\u5173\u7cfb\uff0c\u9700\u8981\u591a\u8868\u8bbe\u8ba1\u3002<\/p>\n\n\n\n
                                      \u4e00\u5bf9\u4e00<\/h3>\n\n\n\n
                                      \u5728\u5173\u7cfb\u578b\u6570\u636e\u5e93\u4e2d\uff0c\u591a\u8868\u8bbe\u8ba1\u4e2d\u7684\u4e00\u5bf9\u4e00\u5173\u7cfb\u6307\u7684\u662f\u4e24\u4e2a\u8868\u4e4b\u95f4\u7684\u5173\u7cfb\uff0c\u5176\u4e2d\u4e00\u4e2a\u8868\u7684\u8bb0\u5f55\u53ea\u80fd\u5bf9\u5e94\u53e6\u4e00\u4e2a\u8868\u4e2d\u7684\u4e00\u6761\u8bb0\u5f55\uff0c\u53cd\u4e4b\u4ea6\u7136\u3002\u8fd9\u79cd\u5173\u7cfb\uff0c\u5728\u4efb\u610f\u4e00\u65b9\u6dfb\u52a0\u5173\u7cfb\u5373\u53ef\u3002<\/strong><\/p>\n\n\n\n
                                        \n
                                      • \u4eba\u548c\u8eab\u4efd\u8bc1\u53f7<\/li>\n\n\n\n
                                      • \u5b66\u53f7\u548c\u5b66\u751f<\/li>\n\n\n\n
                                      • \u7528\u6237\u548c\u7528\u6237\u8be6\u60c5<\/li>\n<\/ul>\n\n\n\n
                                        \"\"<\/div><\/figure>\n\n\n\n
                                        \n
                                        \u6240\u6709\u7684\u4e00\u4e00\u5bf9\u5e94\u7684\u8868\uff0c\u5728\u903b\u8f91\u4e0a\uff0c\u90fd\u53ef\u4ee5\u5408\u5e76\u4e3a\u4e00\u4e2a\u8868\u3002<\/p>\n<\/blockquote>\n\n\n\n
                                        \u4e3a\u4ec0\u4e48\u672c\u6765\u53ef\u4ee5\u7528\u4e00\u5f20\u8868\uff0c\u5374\u8981\u62c6\u6210\u4e24\u5f20\u8868\uff1f<\/strong><\/p>\n\n\n\n
                                        \u4e3b\u8981\u7684\u539f\u56e0\u662f\u6548\u7387\u3002\u5982\u679c\u4e00\u4e2a\u8868\u7684\u5217\u592a\u591a\uff0c\u6bd4\u5982\u6709300\u5217\u3002\u6700\u7ec8\u6570\u636e\u91cf\u592a\u5927\u7684\u65f6\u5019\uff0c\u6548\u7387\u4f1a\u5f88\u5dee\u3002\u4f46\u662f\u5982\u679c\u5c06\u5176\u62c6\u5206\u6210\u4e24\u4e2a\u8868\uff0c\u6700\u7ec8\u9891\u7e41\u67e5\u8be2\u7684\u8fd9\u4e2a\u8868\uff0c\u5c06\u5176\u5217\u5f04\u5f97\u5c11\u4e00\u70b9\uff0c\u4f1a\u63d0\u5347\u67e5\u8be2\u6548\u7387\u3002<\/p>\n\n\n\n
                                        \u6bd4\u5982\uff0c\u6dd8\u5b9d\u3002\u7528\u6237\u8868\uff0c\u6bcf\u5929\u90fd\u8981\u5927\u91cf\u4f7f\u7528\u3002 \u6bd4\u5982\uff0c\u5355\u8868300\u5217\uff0c\u67093\u4ebf\u4eba\u90fd\u5728\u7528\u3002<\/p>\n\n\n\n
                                        \u53ef\u4ee5\u628a\u8fd9\u4e2a\u8868\u62c6\u6210\u4e00\u4e2a\u5c0f\u8868+\u53e6\u4e00\u4e2a\u5927\u8868\u3002<\/p>\n\n\n\n
                                        10\u5217\u3002 290\u5217\u3002<\/p>\n\n\n\n
                                        \u4e00\u5bf9\u591a<\/h3>\n\n\n\n
                                        \u5728\u5173\u7cfb\u578b\u6570\u636e\u5e93\u4e2d\uff0c\u591a\u8868\u8bbe\u8ba1\u4e2d\u7684\u4e00\u5bf9\u591a\u5173\u7cfb\u6307\u7684\u662f\u4e24\u4e2a\u8868\u4e4b\u95f4\u7684\u5173\u7cfb\uff0c\u5176\u4e2d\u4e00\u4e2a\u8868\u7684\u8bb0\u5f55\u53ef\u4ee5\u5bf9\u5e94\u53e6\u4e00\u4e2a\u8868\u4e2d\u7684\u591a\u6761\u8bb0\u5f55\uff0c\u800c\u53e6\u4e00\u4e2a\u8868\u4e2d\u7684\u6bcf\u6761\u8bb0\u5f55\u53ea\u80fd\u5bf9\u5e94\u4e00\u4e2a\u8868\u4e2d\u7684\u8bb0\u5f55\u3002\u8fd9\u79cd\u5173\u7cfb\uff0c\u4f1a\u5728\u591a\u7684\u4e00\u65b9\u6dfb\u52a0\u5b57\u6bb5\u6765\u8868\u793a\u5173\u7cfb\u3002<\/strong><\/p>\n\n\n\n
                                        \u4e00\u5bf9\u591a\u662f\u6307 \u5b58\u5728\u8868A\u548c\u8868B\uff0c\u8868A\u4e2d\u7684\u4e00\u6761\u6570\u636e\uff0c\u5bf9\u5e94\u8868B\u4e2d\u7684\u591a\u6761\u6570\u636e\uff1b\u800c\u8868B\u4e2d\u7684\u4e00\u6761\u6570\u636e\uff0c\u5bf9\u5e94\u8868A\u4e2d\u7684\u4e00\u6761\u6570\u636e\u3002<\/p>\n\n\n\n
                                          \n
                                        • \u73ed\u7ea7\u548c\u5b66\u751f<\/li>\n\n\n\n
                                        • \u7701\u4efd\u548c\u57ce\u5e02<\/li>\n\n\n\n
                                        • \u7528\u6237\u548c\u8ba2\u5355<\/li>\n\n\n\n
                                        • \u54c1\u724c\u548c\u5546\u54c1<\/li>\n<\/ul>\n\n\n\n
                                          \"\"<\/div><\/figure>\n\n\n\n
                                          \u5728”\u591a”\u8868\u4e2d\u7ef4\u62a4”\u4e00”\u8868\u7684\u4e3b\u952e<\/strong><\/p>\n\n\n\n
                                          \u591a\u5bf9\u591a<\/h3>\n\n\n\n
                                          \u5728\u5173\u7cfb\u578b\u6570\u636e\u5e93\u4e2d\uff0c\u591a\u8868\u8bbe\u8ba1\u4e2d\u7684\u591a\u5bf9\u591a\u5173\u7cfb\u6307\u7684\u662f\u4e24\u4e2a\u8868\u4e4b\u95f4\u7684\u5173\u7cfb\uff0c\u5176\u4e2d\u4e00\u4e2a\u8868\u7684\u8bb0\u5f55\u53ef\u4ee5\u5bf9\u5e94\u53e6\u4e00\u4e2a\u8868\u4e2d\u7684\u591a\u6761\u8bb0\u5f55\uff0c\u800c\u53e6\u4e00\u4e2a\u8868\u4e2d\u7684\u6bcf\u6761\u8bb0\u5f55\u4e5f\u53ef\u4ee5\u5bf9\u5e94\u53e6\u4e00\u4e2a\u8868\u4e2d\u7684\u591a\u6761\u8bb0\u5f55\u3002\u8fd9\u79cd\u5173\u7cfb\u901a\u5e38\u9700\u8981\u901a\u8fc7\u4e2d\u95f4\u8868\u6765\u5b9e\u73b0\u3002<\/strong><\/p>\n\n\n\n
                                          \u591a\u5bf9\u591a\u5176\u5b9e\u662f\u6307\u5b58\u5728\u8868A\u548c\u8868B\uff0c\u8868A\u4e2d\u7684\u4e00\u6761\u6570\u636e\uff0c\u5bf9\u5e94\u8868B\u4e2d\u7684\u591a\u6761\u6570\u636e\uff1b\u800c\u8868B\u4e2d\u7684\u4e00\u6761\u6570\u636e\uff0c\u5bf9\u5e94\u8868A\u4e2d\u7684\u591a\u6761\u6570\u636e\u3002<\/p>\n\n\n\n
                                          \u4e92\u4e3a\u4e00\u5bf9\u591a<\/strong><\/p>\n\n\n\n
                                            \n
                                          • \u5b66\u751f\u548c\u8bfe\u7a0b<\/li>\n\n\n\n
                                          • \u8ba2\u5355\u548c\u5546\u54c1<\/li>\n\n\n\n
                                          • \u54c1\u724c\u548c\u7c7b\u76ee<\/li>\n<\/ul>\n\n\n\n
                                            \"\"<\/div><\/figure>\n\n\n\n
                                            \u6570\u636e\u5e93\u8bbe\u8ba1\u4e09\u5927\u8303\u5f0f<\/h3>\n\n\n\n
                                            \u6570\u636e\u5e93\u8868\u8bbe\u8ba1\u7684\u65f6\u5019\uff0c\u5e94\u8be5\u9075\u5faa\u7684\u89c4\u8303\u3002\u53ea\u6709\u9075\u5faa\u4e86\u8fd9\u4e9b\u8303\u5f0f\uff08\u89c4\u8303\uff09\uff0c\u8bbe\u8ba1\u51fa\u6765\u7684\u8868\u624d\u662f\u597d\u7684\u3002\u524d\u4eba\u603b\u7ed3\u51fa\u6765\u7684\u4e00\u4e9b\u539f\u5219\uff0c\u88ab\u79f0\u4e4b\u4e3a\u8303\u5f0f\u3002<\/p>\n\n\n\n
                                            \u7b2c\u4e00\u8303\u5f0f<\/strong><\/p>\n\n\n\n
                                            \u6bcf\u4e00\u5217\u5e94\u8be5\u4fdd\u6301\u539f\u5b50\u6027<\/strong>\u3002\u5728\u8bbe\u8ba1\u8868\u683c\u7684\u65f6\u5019\uff0c\u8981\u9075\u5b88\u3002<\/p>\n\n\n\n
                                            \u4e00\u5b9a\u8981\u7559\u6709\u4e00\u5b9a\u7a7a\u95f4\uff0c\u7075\u6d3b\u7a7a\u95f4\u3002<\/p>\n\n\n\n
                                            \n
                                            \u539f\u5b50\u6027\uff1a\u8868\u793a\u8868\u4e2d\u7684\u6570\u636e\u90fd\u662f\u4e00\u4e2a\u4e0d\u53ef\u62c6\u5206\u7684\u6700\u5c0f\u5355\u5143\u3002<\/strong><\/p>\n<\/blockquote>\n\n\n\n
                                            \"\"<\/div><\/figure>\n\n\n\n
                                            \n
                                            \u7b2c\u4e00\u8303\u5f0f\uff1a\u662f\u8ddf\u7740\u4e1a\u52a1\u8d70\u7684\u3002\u4f46\u662f\u4e1a\u52a1\u662f\u53d8\u52a8\u7684\uff0c\u6240\u4ee5\u6211\u4eec\u5728\u8bbe\u8ba1\u8868\u7684\u65f6\u5019\uff0c\u5e94\u8be5\u8003\u8651\u4e4b\u540e\u4e1a\u52a1\u7684\u53d8\u5316\uff0c\u6765\u5c3d\u91cf\u7684\u8ba9\u6bcf\u4e00\u5217\u4fdd\u6301\u539f\u5b50\u6027\u3002<\/p>\n<\/blockquote>\n\n\n\n
                                            \u59d3\u540d\u8fd9\u4e1c\u897f\uff0c\u662f\u5426\u9700\u8981\u5206\u3002<\/p>\n\n\n\n
                                            \u7b2c\u4e8c\u8303\u5f0f<\/strong><\/p>\n\n\n\n
                                            \u8bb0\u5f55\u7684\u552f\u4e00\u6027<\/strong>\u3002<\/p>\n\n\n\n
                                            \u552f\u4e00\u6027\u662f\u6307\u6bcf\u4e00\u6761\u8bb0\u5f55\u90fd\u6709\u552f\u4e00\u7684\u6807\u8bc6\u3002\u4e3b\u952e<\/strong>\u3002\u8868\u4e2d\u5fc5\u987b\u5f97\u6709\u4e00\u4e2a \u4e3b\u952e\u3002<\/p>\n\n\n\n
                                            create table test1(\n\tid int primary key auto_increment\n)<\/code><\/pre>\n\n\n\n
                                            \u7b2c\u4e09\u8303\u5f0f<\/strong><\/p>\n\n\n\n
                                            \u6570\u636e\u4e0d\u8981\u5197\u4f59\u3002<\/p>\n\n\n\n
                                            \"\"<\/div><\/figure>\n\n\n\n
                                            \u5728\u4e0a\u8868\u4e2d\uff0c\u73ed\u4e3b\u4efb\u540d\u5b57\u91cd\u590d\u5b58\u50a8\u4e86\uff0c\u5197\u4f59\u4e86<\/p>\n\n\n\n
                                              \n
                                            • \u7f3a\u70b9\uff1a<\/li>\n<\/ul>\n\n\n\n
                                                \n
                                              1. \u91cd\u590d\u5b58\u50a8\u4e86\uff0c\u9700\u8981\u5360\u7528\u66f4\u591a\u7684\u78c1\u76d8\u7a7a\u95f4<\/li>\n\n\n\n
                                              2. \u5982\u679c\u8981\u53bb\u4fee\u6539\u67d0\u4e2a\u8001\u5e08\u7684\u540d\u5b57\uff0c\u90a3\u4e48\u9700\u8981\u5728\u591a\u4e2a\u5730\u65b9\u8fdb\u884c\u4fee\u6539\uff0c\u589e\u52a0\u4e86\u6570\u636e\u7684\u7ef4\u62a4\u6210\u672c<\/li>\n<\/ol>\n\n\n\n
                                                  \n
                                                • \u4f18\u70b9\uff1a<\/li>\n<\/ul>\n\n\n\n
                                                    \n
                                                  1. \u6839\u636e\u5b66\u751f\u53bb\u67e5\u73ed\u4e3b\u4efb\u7684\u540d\u5b57\u53d8\u5f97\u66f4\u7b80\u5355\u4e86\uff0c\u67e5\u8be2\u6548\u7387\u53d8\u9ad8\u4e86<\/li>\n<\/ol>\n\n\n\n
                                                    \u591a\u8868\u67e5\u8be2<\/h2>\n\n\n\n
                                                    \u591a\u8868\u67e5\u8be2\u662f\u6307\u5728\u5173\u7cfb\u578b\u6570\u636e\u5e93\u4e2d\uff0c\u4ece\u591a\u4e2a\u8868\u4e2d\u67e5\u8be2\u6570\u636e\u7684\u64cd\u4f5c\u3002\u591a\u8868\u67e5\u8be2\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u83b7\u5f97\u66f4\u52a0\u4e30\u5bcc\u7684\u6570\u636e\uff0c\u4ee5\u6ee1\u8db3\u5404\u79cd\u4e0d\u540c\u7684\u9700\u6c42\u3002<\/p>\n\n\n\n
                                                    \u8fde\u63a5\u67e5\u8be2\u2757\u2757\u2757<\/h3>\n\n\n\n
                                                    \u5148\u6765\u505a\u6570\u636e\u51c6\u5907<\/p>\n\n\n\n
                                                    -- \u5982\u679c\u8fd9\u4e2a\u8868\u5b58\u5728 \u5c31\u5220\u9664\ndrop table if exists user;\ncreate table user(\n\tid int primary key auto_increment,\n\tname varchar(255),\n\tpassword varchar(255)\n);\n\ndrop table if exists user_detail;\ncreate table user_detail(\n\tid int primary key auto_increment,\n\tuser_id int,\n\taddress varchar(255),\n\tpic varchar(255)\n);\n\ninsert into user values (1, \"\u732a\u516b\u6212\", \"zhubajie\");\ninsert into user values (2, \"\u5b59\u609f\u7a7a\", \"sunwukong\");\ninsert into user values (3, \"\u767d\u9aa8\u7cbe\", \"baigujing\");\ninsert into user values (4, \"\u5510\u50e7\", \"tangseng\");\ninsert into user values (5, \"\u6c99\u50e7\", \"shaseng\");\n\nselect * from user;\n\ninsert into user_detail values(null, 1, \"\u9ad8\u8001\u5e84\", \"\u732a\u516b\u6212.jpg\");\ninsert into user_detail values(null, 2, \"\u82b1\u679c\u5c71\", \"\u5b59\u609f\u7a7a.jpg\");\ninsert into user_detail values(null, 3, \"\u767d\u864e\u5cad\", \"\u767d\u9aa8\u7cbe.jpg\");\ninsert into user_detail values(null, 4, \"\u4e1c\u571f\u5927\u5510\", \"\u5510\u50e7.jpg\");\n\nselect * from user_detail;<\/code><\/pre>\n\n\n\n
                                                    \"\"<\/div><\/figure>\n\n\n\n
                                                    \u4ea4\u53c9\u8fde\u63a5<\/strong><\/p>\n\n\n\n
                                                    \u4ea4\u53c9\u8fde\u63a5\u5176\u5b9e\u5c31\u662f\u6c42\u591a\u4e2a\u8868\u7684\u7b1b\u5361\u5c14\u79ef\u3002<\/p>\n\n\n\n
                                                    -- \u4ea4\u53c9\u8fde\u63a5\nselect * from user cross join user_detail;<\/code><\/pre>\n\n\n\n
                                                    \n
                                                    \u4ea4\u53c9\u8fde\u63a5\u7684\u7ed3\u679c\u6ca1\u6709\u5b9e\u9645\u7684\u610f\u4e49\u3002<\/p>\n<\/blockquote>\n\n\n\n
                                                    \n
                                                    \u4f46\u662f\u5185\u8fde\u63a5\u548c\u5916\u8fde\u63a5\u90fd\u662f\u57fa\u4e8e\u4ea4\u53c9\u8fde\u63a5\u7684\u7ed3\u679c\u53bb\u7b5b\u9009\u7684\u3002<\/p>\n<\/blockquote>\n\n\n\n
                                                    \u6bd4\u5982\u8868A\u67093\u6761\u6570\u636e\uff0c\u8868B\u4e2d\u67094\u6761\u6570\u636e\uff0c\u6700\u7ec8\u4f1a\u67093*4=12\u6761\u6570\u636e\u3002\u8fd9\u4e2a\u88ab\u79f0\u4e3a\u7b1b\u5361\u5c14\u79ef<\/p>\n\n\n\n
                                                    \u5185\u8fde\u63a5<\/strong><\/p>\n\n\n\n
                                                    \u5185\u8fde\u63a5\uff08inner join\uff09\u662f\u4e00\u79cdSQL\u4e2d\u7684\u8868\u8fde\u63a5\u64cd\u4f5c\uff0c\u7528\u4e8e\u5c06\u4e24\u4e2a\u6216\u591a\u4e2a\u8868\u4e2d\u7684\u6570\u636e\u8fdb\u884c\u5408\u5e76\u5339\u914d\u3002\u5185\u8fde\u63a5\u53ea\u8fd4\u56de\u4e24\u4e2a\u8868\u4e2d\u5177\u6709\u76f8\u540c\u503c\u7684\u884c\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u53ea\u6709\u5728\u8fde\u63a5\u5217\u4e2d\u5b58\u5728\u5339\u914d\u503c\u7684\u884c\u624d\u4f1a\u88ab\u8fd4\u56de\u3002<\/strong><\/p>\n\n\n\n
                                                    \u5185\u8fde\u63a5\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n
                                                    SELECT columns\nFROM table1\nINNER JOIN table2\nON table1.column = table2.column;\n\n-- \u5176\u4e2d\uff0ccolumns\u662f\u8981\u8fd4\u56de\u7684\u5217\uff0ctable1\u548ctable2\u662f\u8981\u8fde\u63a5\u7684\u8868\uff0ccolumn\u662f\u8981\u8fde\u63a5\u7684\u5217\u3002ON\u5b50\u53e5\u6307\u5b9a\u4e86\u8fde\u63a5\u6761\u4ef6\uff0c\u5b83\u6307\u5b9a\u4e86table1\u548ctable2\u4e4b\u95f4\u7684\u5339\u914d\u6761\u4ef6\u3002<\/code><\/pre>\n\n\n\n
                                                    inner join<\/p>\n\n\n\n
                                                      \n
                                                    • \u663e\u5f0f<\/li>\n<\/ul>\n\n\n\n
                                                        -- \u663e\u5f0f\u5185\u8fde\u63a5\n  select * from user inner join user_detail \n  on user.id = user_detail.user_id;\n  \n  -- \u8fd9\u4e2aSQL\u8bed\u53e5\u5c06user\u548cuser_detail\u8868\u8fde\u63a5\u8d77\u6765\uff0c\u53ea\u8fd4\u56de\u4e24\u4e2a\u8868\u90fd\u6709\u76f8\u540c\u7684id\u7684\u884c\u3002<\/code><\/pre>\n\n\n\n
                                                        \n
                                                      • \u9690\u5f0f<\/li>\n<\/ul>\n\n\n\n
                                                          -- \u9690\u5f0f\u5185\u8fde\u63a5\u3002\u4e0d\u5efa\u8bae\u8fd9\u6837\u5199\u3002\n  select * from user,user_detail \n  where user.id =user_detail.user_id;<\/code><\/pre>\n\n\n\n
                                                        \u5916\u8fde\u63a5<\/strong><\/p>\n\n\n\n
                                                        \u5916\u8fde\u63a5\uff08outer join\uff09\u662f\u4e00\u79cdSQL\u4e2d\u7684\u8868\u8fde\u63a5\u64cd\u4f5c\uff0c\u7528\u4e8e\u5c06\u4e24\u4e2a\u6216\u591a\u4e2a\u8868\u4e2d\u7684\u6570\u636e\u8fdb\u884c\u5408\u5e76\u5339\u914d\uff0c\u4e0e\u5185\u8fde\u63a5\u4e0d\u540c\u7684\u662f\uff0c\u5916\u8fde\u63a5\u4f1a\u8fd4\u56de\u5de6\u8868\u6216\u53f3\u8868\u4e2d\u5373\u4f7f\u6ca1\u6709\u5339\u914d\u7684\u884c\u4e5f\u4f1a\u88ab\u8fd4\u56de\uff0c\u8fd9\u4e9b\u6ca1\u6709\u5339\u914d\u7684\u884c\u5c06\u88ab\u586b\u5145\u4e3aNULL\u503c\u3002<\/strong><\/p>\n\n\n\n
                                                        \u5916\u8fde\u63a5\u6709\u5de6\u5916\u8fde\u63a5\uff08left outer join\uff09\u3001\u53f3\u5916\u8fde\u63a5\uff08right outer join\uff09\u548c\u5168\u5916\u8fde\u63a5\uff08@\uff09\u4e09\u79cd\u7c7b\u578b\u3002<\/p>\n\n\n\n
                                                        \u8bf4\u660e\uff1a\u4f46\u662fMySQL\u4e0d\u652f\u6301\u5168\u5916\u8fde\u63a5\u3002<\/p>\n\n\n\n
                                                        \u5de6\u53f3\u8868\u4e2d\u7684\u6570\u636e\u90fd\u4fdd\u7559\u3002<\/p>\n\n\n\n
                                                        outer\u53ef\u4ee5\u7701\u7565\u6389\u3002<\/p>\n\n\n\n
                                                        \u5de6\u5916\u8fde\u63a5<\/strong><\/p>\n\n\n\n
                                                        \u5de6\u5916\u8fde\u63a5\u8fd4\u56de\u5de6\u8868\u4e2d\u7684\u6240\u6709\u884c\u4ee5\u53ca\u53f3\u8868\u4e2d\u4e0e\u5de6\u8868\u5339\u914d\u7684\u884c\uff0c\u53f3\u8868\u4e2d\u6ca1\u6709\u5339\u914d\u7684\u884c\u5c06\u88ab\u586b\u5145\u4e3aNULL\u503c\u3002\u5de6\u5916\u8fde\u63a5\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n
                                                        SELECT columns\nFROM table1\nLEFT OUTER JOIN table2\nON table1.column = table2.column;\n\n-- \u5de6\u5916\u8fde\u63a5\uff0c\u4fdd\u7559\u5339\u914d\u7684\u6570\u636e\u3002\u8fd8\u4f1a\u4fdd\u7559\u5de6\u8868\u7684\u6240\u6709\u6570\u636e<\/code><\/pre>\n\n\n\n
                                                        -- \u5de6\u5916\u8fde\u63a5\nselect * from user left outer join user_detail on \nuser.id = user_detail.user_id;<\/code><\/pre>\n\n\n\n
                                                        \u53f3\u5916\u8fde\u63a5<\/strong><\/p>\n\n\n\n
                                                        \u53f3\u5916\u8fde\u63a5\u8fd4\u56de\u53f3\u8868\u4e2d\u7684\u6240\u6709\u884c\u4ee5\u53ca\u5de6\u8868\u4e2d\u4e0e\u53f3\u8868\u5339\u914d\u7684\u884c\uff0c\u5de6\u8868\u4e2d\u6ca1\u6709\u5339\u914d\u7684\u884c\u5c06\u88ab\u586b\u5145\u4e3aNULL\u503c\u3002\u53f3\u5916\u8fde\u63a5\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n
                                                        SELECT columns\nFROM table1\nRIGHT JOIN table2\nON table1.column = table2.column;<\/code><\/pre>\n\n\n\n
                                                        -- \u53f3\u5916\u8fde\u63a5\nselect * from user right outer join user_detail on \nuser.id = user_detail.user_id;<\/code><\/pre>\n\n\n\n
                                                        \n
                                                        \u8fde\u63a5\u67e5\u8be2\u6700\u91cd\u8981\u7684\uff0c\u662f\u627e\u5230\u8fde\u63a5\u7684\u6761\u4ef6\u3002<\/strong><\/p>\n<\/blockquote>\n\n\n\n
                                                        \u5b50\u67e5\u8be2\uff08\u4e86\u89e3\uff09<\/h3>\n\n\n\n
                                                        \u5728\u5173\u7cfb\u578b\u6570\u636e\u5e93\u4e2d\uff0c\u5b50\u67e5\u8be2\u662f\u6307\u5728\u4e00\u4e2a SQL \u8bed\u53e5\u4e2d\u5d4c\u5957\u53e6\u4e00\u4e2a SQL \u8bed\u53e5\u6765\u5b9e\u73b0\u67e5\u8be2\u7684\u65b9\u5f0f\u3002\u5b50\u67e5\u8be2\u901a\u5e38\u7528\u4e8e\u5728\u67e5\u8be2\u7ed3\u679c\u4e2d\u8fc7\u6ee4\u3001\u6392\u5e8f\u3001\u5206\u7ec4\u6216\u8005\u7edf\u8ba1\u6570\u636e\uff0c\u6216\u8005\u4f5c\u4e3a\u5176\u4ed6\u67e5\u8be2\u8bed\u53e5\u7684\u4e00\u90e8\u5206\u3002<\/p>\n\n\n\n
                                                        \u5b50\u67e5\u8be2\u53ef\u4ee5\u5d4c\u5957\u591a\u5c42\uff0c\u6bcf\u4e00\u5c42\u90fd\u8fd4\u56de\u4e00\u4e2a\u7ed3\u679c\u96c6\u4f9b\u4e0a\u4e00\u5c42\u4f7f\u7528\u3002<\/p>\n\n\n\n
                                                        \u5b50\u67e5\u8be2\u53ef\u4ee5\u7528\u4e8e\u5b9e\u73b0\u5404\u79cd\u590d\u6742\u7684\u67e5\u8be2\u9700\u6c42\uff0c\u4f8b\u5982\uff0c\u4f7f\u7528\u5b50\u67e5\u8be2\u67e5\u8be2\u6700\u5927\u503c\u6216\u6700\u5c0f\u503c\uff0c\u4f7f\u7528\u5b50\u67e5\u8be2\u5b9e\u73b0\u5206\u7ec4\u7edf\u8ba1\u7b49\u7b49\u3002\u4f46\u662f\uff0c\u7531\u4e8e\u5b50\u67e5\u8be2\u4f1a\u589e\u52a0\u67e5\u8be2\u7684\u590d\u6742\u5ea6\u548c\u6267\u884c\u65f6\u95f4\uff0c\u56e0\u6b64\u5728\u4f7f\u7528\u5b50\u67e5\u8be2\u65f6\u9700\u8981\u6ce8\u610f\u67e5\u8be2\u6027\u80fd\u7684\u5f71\u54cd\u3002<\/p>\n\n\n\n
                                                        \u4e00\u4e2aSQL\u8bed\u53e5\u7684\u7ed3\u679c\u53ef\u4ee5\u4f5c\u4e3a\u53e6\u5916\u4e00\u4e2aSQL\u8bed\u53e5\u7684\u6761\u4ef6\u3002<\/p>\n\n\n\n
                                                        -- \u73b0\u5728\u60f3\u627e\u6709\u54ea\u4e9b\u540c\u5b66\u5b66\u4e86Java\u3002\n\n\n-- \u9996\u5148\u5148\u62ff\u5230Java\u7684id\nselect id from tec_cource where name='Java'; -- 1\n-- \u7136\u540e\u518d\u628a\u8fd9\u4e2aid=1 \u653e\u7ed9\u7b2c\u4e8c\u4e2a\nselect * from tec_sele_cource where cource_id=1; -- 1,3\n\nselect * from tec_stu where id in (1,3);\n\n-- \u770b\u5b66\u751f\u4fe1\u606f\nselect * from tec_stu where id in (\n    -- \u770b\u54ea\u4e9b\u5b66\u751f\u9009\u4e86 Java\n\tselect student_id from tec_sele_cource where cource_id=(\n        -- \u83b7\u53d6Java\u7684id\n\t\tselect id from tec_cource where name='Java'\n\t)\n)<\/code><\/pre>\n\n\n\n
                                                        \u4e0d\u5efa\u8bae\u5927\u5bb6\u7528\u3002\u6548\u7387\u5dee\u3002\u56e0\u4e3a\u6bcf\u4e00\u5c42\u67e5\u8be2\u4f1a\u751f\u6210\u4e34\u65f6\u8868<\/p>\n\n\n\n
                                                        \u8054\u5408\u67e5\u8be2\uff08\u4e86\u89e3\uff09<\/h3>\n\n\n\n
                                                        SQL\u652f\u6301\u628a\u591a\u4e2aSQL\u8bed\u53e5\u7684\u7ed3\u679c\u62fc\u88c5\u8d77\u6765\u3002<\/p>\n\n\n\n
                                                        -- \u5199\u4e86\u4e24\u4e2aSQL\u3002\u628a\u4e24\u4e2aSQL\u7684\u7ed3\u679c\u62fc\u63a5\u8d77\u6765\n\nselect * from student_t where class = '\u4e00\u73ed'\nunion\nselect * from student_t where class = '\u4e8c\u73ed';\n\n-- union\u8981\u6c42\u8fd4\u56de\u7684\u5217\u6570\u76ee\u8981\u4e00\u81f4 \n\n-- \u6211\u4eec\u53ef\u4ee5\u4f7f\u7528union\u5173\u952e\u5b57\u5bf9SQL1\u548cSQL2\u7684\u7ed3\u679c\u53bb\u505a\u5e76\u96c6\uff0c\u4e00\u822c\u6765\u8bf4\u8054\u5408\u67e5\u8be2\u4f5c\u7528\u4e0d\u5927\n\nselect * from student_t where class in ('\u4e00\u73ed','\u4e8c\u73ed');\n-- \u5f53\u4e0a\u9762\u8fd9\u4e2aSQL\u8bed\u53e5\u67e5\u8be2\u901f\u5ea6\u5f88\u6162\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u8003\u8651union\u8054\u5408\u67e5\u8be2\u6765\u63d0\u9ad8\u6548\u7387\u3002\n\n-- union all  \u4f1a\u628asql\u7684\u7ed3\u679c\uff0c\u76f4\u63a5\u62fc\u63a5\u8d77\u6765\u3002\nselect * from student_t where class = '\u4e00\u73ed'  \nunion all  \nselect * from student_t where class = '\u4e8c\u73ed';<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
                                                        \u5f15\u5165 \u5982\u679c\u6709\u4e00\u6bb5\u5b66\u751f\u4fe1\u606f\uff0c\u90a3\u4e48\u4f60\u4f1a\u4ea7\u751f\u54ea\u4e9b\u5904\u7406\uff1f \u57fa\u672c\u4e0a\u4f60\u7684\u64cd\u4f5c\u90fd\u662f\u56f4\u7ed5\u7684\u589e\u5220\u6539\u67e5\u6765\u505a\u7684\uff0c\u65b0\u589e\u5b66\u751f\u8bb0\u5f55\uff0c\u5220\u9664\u5b66 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-443","post","type-post","status-publish","format-standard","hentry","category-learn"],"_links":{"self":[{"href":"https:\/\/larkdrop.cafe\/index.php\/wp-json\/wp\/v2\/posts\/443","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/larkdrop.cafe\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/larkdrop.cafe\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/larkdrop.cafe\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/larkdrop.cafe\/index.php\/wp-json\/wp\/v2\/comments?post=443"}],"version-history":[{"count":2,"href":"https:\/\/larkdrop.cafe\/index.php\/wp-json\/wp\/v2\/posts\/443\/revisions"}],"predecessor-version":[{"id":462,"href":"https:\/\/larkdrop.cafe\/index.php\/wp-json\/wp\/v2\/posts\/443\/revisions\/462"}],"wp:attachment":[{"href":"https:\/\/larkdrop.cafe\/index.php\/wp-json\/wp\/v2\/media?parent=443"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/larkdrop.cafe\/index.php\/wp-json\/wp\/v2\/categories?post=443"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/larkdrop.cafe\/index.php\/wp-json\/wp\/v2\/tags?post=443"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}