大家好,又见面了,我是你们的朋友全栈君。
1,删除表中重复数据,仅保留重复数据id最小的
delete from yyd_wykl_goodsInfo
where skuId in (select skuId from (select skuId from yyd_wykl_goodsInfo group by skuId having count(skuId) > 1) a)
and id not in ( select id from (select min(id) as id from yyd_wykl_goodsInfo group by skuId having count(skuId )>1) b);
2,查找表中多余的重复记录(多个字段),不包含id最小的记录
select * from yyd_wykl_goodsInfo as s
where s.id,s.title in (select id,title from yyd_wykl_goodsInfo group by id,name having count(id)>1)
and s.id not in ( select min(id) as id from yyd_wykl_goodsInfo group by id,name having count(id )>1);
3,查找表中多余的重复记录,重复记录是根据单个字段(userId)来判断
select * from user
where userId in (select userId from usergroup by peopleId having count(userId) > 1)
4、查找表中多余的重复记录(多个字段)
select * from user a
where (a.userId,a.name) in (select userId,name from user group by userId,name having count(*) > 1)
发布者:全栈程序员-用户IM,转载请注明出处:https://javaforall.cn/105915.html原文链接:https://javaforall.cn
【正版授权,激活自己账号】: Jetbrains全家桶Ide使用,1年售后保障,每天仅需1毛
【官方授权 正版激活】: 官方授权 正版激活 支持Jetbrains家族下所有IDE 使用个人JB账号...