查询名字重复的数据
select * from user where username in (select username from user group by username having count(username)>1)
根据多个字段查询表中这些字段相同的数据
select * from user
where id in (select id from user GROUP BY id,name having count(1)>1)
and name in (select name from user GROUP BY
id,name having having count(1)>1)
ORDER BY id,name
查询按姓名分组取最大值
select id,username,max(created_date) as created_date from user group by username having count(id)>1
最后
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