关于sql错误1093

昨天在我写了一条查询并删除重复数据,但是保存一条的sql发生了一个错误

DELETE FROM people

WHERE people_id NOT IN

(SELECT MIN(people_id) FROM people GROUP BY people/_no  HAVING COUNT(people_no)>1)

错误代码： 1093

You can't specify target table 'info_dossier_case' for update in FROM clause

百度查了之后成

DELETE FROM people

WHERE people_id NOT IN (SELECT c.* FROM

(SELECT MIN(people_id) FROM people GROUP BY people_no  HAVING COUNT(people_no)>1)c)

具体的原因呢就是mysql数据库不能在同一张表里同时进行查和删除操作,就有点像list在遍历(不用iterator)时不能进行删除操作

所以解决方法就是把查询出来的数据单独形成一个临时表,再从里面删除就行了