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

时间:2023-07-16 19:28:32

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