mysql 删除重复数据

2017-12-11 14:28:16

删除某个字段(note_id)重复的数据

!--找出重复数据id较小的--
select min(id) from tb group by note_id having count(note_id) > 1

!--执行删除--
delete from tb where id in(select min(id) from tb group by note_id having count(note_id) > 1)

报错：You can’t specify target table ‘tb’ for update in FROM clause

!--修改下sql--
delete from tb where id in (select a.id from (select min(id) id from tb group by note_id having count(note_id) > 1) a)