删除重复的数据delete user1 from t_user user1,(select t1.id from t_user t1,(select username,min(id)
删除重复的数据
delete user1 from t_user user1,(select t1.id from t_user t1,(select username,min(id) as minid from t_user group by username having count(username)>1) t2 where t1.username=t2.username and t1.id<>t2.minid) user2 where user1.id=user2.id
