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: 0
2）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);
