MySQL多表删除
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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)