Mysql update in报错 [Err] 1093 - You can't specify target table 'company_info' for update in FROM clause

Mysql update in报错 解决方案：

　　[Err] 1093 - You can't specify target table 'company_info' for update in FROM clause

　　意思是不能在同一语句中更新select出的同一张表元组的属性值

　　解决方法：将select出的结果通过中间表再select一遍即可。

错误sql：

update company_info set email = '[e-mail]'
where  id in   (select t.id  from company_info t where t.id<3) 

修改后可执行的sql：

update company_info set email = '[e-mail]'
where  id in  (select a.id from (select t.id  from company_info t where t.id<3)a )