sql 查重

时间:2020-05-22 14:38:51   收藏:0   阅读:75
SELECT * FROM `表名1` WHERE 字段1 in(select sn from 表名1 group by 字段1 having count(*)>1)
SELECT sn ,count(*) as a FROM `表名` group by sn having a>1

 

原文:https://www.cnblogs.com/xiangangXu1997/p/12936488.html

评论(0
© 2014 bubuko.com 版权所有 - 联系我们:wmxa8@hotmail.com
打开技术之扣,分享程序人生!