mysql-You can’t specify target table for update in FROM clause错误

mysql中You can't specify target table for update in FROM clause错误的意思是说,不能先select出同一表中的某些值,再update这个表(在同一语句中)

例如

delete from table名称 where idStr in
(
  select h.idStr from table名称 h  
  
group by h.otherKey  
  
having count(1) >1
);

 

就会报上面的错误

delete from table名称 where idStr in
(
    select s.idStr from (
    select h.idStr, h.otherKey,count(1) c from table名称 h     group by h.otherKey   ) s where s.c >1 );

 

通过中间临时表来执行即可解决问题

 

posted @ 2016-12-05 14:21  243573295  阅读(347)  评论(0编辑  收藏  举报