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    • 4-5:MySQL 单表删除记录DELETE

      删除记录(单标删除)的语法结构是:

      DELETE FROM tbl_name [WHERE where_condition]

      比如删除id为6的用户记录:

      mysql> DELETE FROM users WHERE id = 6;
      Query OK, 1 row affected (0.00 sec)
      
      mysql> SELECT * FROM users;
      +----+----------+----------------------------------+-----+------+
      | id | username | password                         | age | sex  |
      +----+----------+----------------------------------+-----+------+
      |  1 | Tom      | 123                              |  29 |    0 |
      |  2 | John     | 123                              |  38 |    0 |
      |  3 | Tom      | 123                              |  27 |    0 |
      |  4 | John     | 123                              |  35 |    0 |
      |  5 | John     | 123                              |  10 |    0 |
      |  7 | Rose     | 202cb962ac59075b964b07152d234b70 |   8 |    0 |
      |  8 | BEn      | 456                              |  17 |    0 |
      +----+----------+----------------------------------+-----+------+
      7 rows in set (0.00 sec)

      可以看到id为6的用户已经被删除,如果此时再插入一条记录,id会为9,而不是6:

      mysql> INSERT users VALUEs(NULL,'111','222',33,NULL);
      Query OK, 1 row affected (0.00 sec)
      
      mysql> SELECT * FROM users;
      +----+----------+----------------------------------+-----+------+
      | id | username | password                         | age | sex  |
      +----+----------+----------------------------------+-----+------+
      |  1 | Tom      | 123                              |  29 |    0 |
      |  2 | John     | 123                              |  38 |    0 |
      |  3 | Tom      | 123                              |  27 |    0 |
      |  4 | John     | 123                              |  35 |    0 |
      |  5 | John     | 123                              |  10 |    0 |
      |  7 | Rose     | 202cb962ac59075b964b07152d234b70 |   8 |    0 |
      |  8 | BEn      | 456                              |  17 |    0 |
      |  9 | 111      | 222                              |  33 | NULL |
      +----+----------+----------------------------------+-----+------+
      8 rows in set (0.00 sec)

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