今天在尝试用子查询来关联更新一个表的收到如下报错：ERROR 1093 (HY000): You can't specify target table 'v_member_info' for update in FROM clause具体执行的sql如下：MySQL [meminfo]> update v_member_info set cust_right_group=0 where id in (select id from v_member_info where pay_end_date<'2018-01-29' and cust_right_group>0);ERROR 1093 (HY000): You can't specify target table 'v_member_info' for update in FROM clause原来是mysql在update的时候， 原始表不能出现在where 后面第一层的子查询中；解决办法：两种改写方法1）改写成join方式更新MySQL [meminfo]> update v_member_info as a ,(select id,cust_right_group from v_member_info where pay_end_date<'2018-01-29' and cust_right_group>0) as b set a.cust_right_group=0 where a.id=b.id;Query OK, 288 rows affected (2.35 sec)Rows matched: 288 Changed: 288 Warnings: 02）或者改成子查询之子查询MySQL [meminfo]> update v_member_info set cust_right_group=0 where id in(select id from (select id from v_member_info where pay_end_date<'2018-01-29' and cust_right_group>0)a);小结：Oracle和MySQL还是有区别的，MySQL在update的时候，原始表不能出现在where 后面第一层的子查询当中，至于两种改写的性能的看具体业务和数据量的大小。