mysql多表删除实例

mysql多表删除

删除某学生基本信息的同时，删除该学生的所有成绩

mysql> select * from stu_inf;+----+----------+--------+-------+-------+--------+| id | stu_xh   | stu_xm | xb_id | xy_id | stu_bj |+----+----------+--------+-------+-------+--------+|  1 | 07150101 | 小明   |     1 |     1 | 1504   ||  2 | 07150240 | 谢育政 |     1 |     2 | 1502   ||  3 | 12341231 | 猴子   |     1 |     2 | 1515   ||  4 | 01591261 | 大大   |     1 |     3 | 1515   ||  5 | 07160202 | 小红   |     2 |     4 | 1602   ||  6 | 07150225 | 黄河   |     1 |     3 | 1315   ||  7 | 01050001 | 华容   |     1 |     7 | 1612   ||  8 | 02050002 | 黄月英 |     2 |     8 | 1608   ||  9 | 01510003 | 欢欢   |     2 |     9 | 1601   || 10 | 05261005 | 大康   |     1 |    10 | 1304   || 13 | 0001     | xxx    |     1 |     2 | 1555   |+----+----------+--------+-------+-------+--------+11 rows in set (0.02 sec)mysql> select * from cj_inf;+-------+----------+---------+----------+| cj_id | cj_stuid | cj_kmid | cj_score |+-------+----------+---------+----------+|     1 |        3 |       1 | 87       ||     2 |        1 |       2 | 65       ||     3 |        4 |       1 | 77       ||     5 |        3 |       9 | 76       ||     7 |        1 |       1 | 90       ||    15 |       13 |       9 | 90       ||    16 |       13 |       8 | 67       ||    13 |       13 |       1 | 88       |+-------+----------+---------+----------+8 rows in set (0.02 sec)

删除语句：

mysql> DELETE stu_inf,cj_inf from stu_inf LEFT JOIN cj_inf ON stu_inf.id=cj_inf.cj_stuid WHERE stu_inf.id=13;Query OK, 4 rows affected (0.00 sec)

执行语句后：

mysql> select * from stu_inf;+----+----------+--------+-------+-------+--------+| id | stu_xh   | stu_xm | xb_id | xy_id | stu_bj |+----+----------+--------+-------+-------+--------+|  1 | 07150101 | 小明   |     1 |     1 | 1504   ||  2 | 07150240 | 谢育政 |     1 |     2 | 1502   ||  3 | 12341231 | 猴子   |     1 |     2 | 1515   ||  4 | 01591261 | 大大   |     1 |     3 | 1515   ||  5 | 07160202 | 小红   |     2 |     4 | 1602   ||  6 | 07150225 | 黄河   |     1 |     3 | 1315   ||  7 | 01050001 | 华容   |     1 |     7 | 1612   ||  8 | 02050002 | 黄月英 |     2 |     8 | 1608   ||  9 | 01510003 | 欢欢   |     2 |     9 | 1601   || 10 | 05261005 | 大康   |     1 |    10 | 1304   |+----+----------+--------+-------+-------+--------+10 rows in set (0.00 sec)mysql> select * from cj_inf;+-------+----------+---------+----------+| cj_id | cj_stuid | cj_kmid | cj_score |+-------+----------+---------+----------+|     1 |        3 |       1 | 87       ||     2 |        1 |       2 | 65       ||     3 |        4 |       1 | 77       ||     5 |        3 |       9 | 76       ||     7 |        1 |       1 | 90       |+-------+----------+---------+----------+5 rows in set (0.02 sec)