欢迎来到素材无忧网,按 + 收藏我们
登录 注册 退出 找回密码

织梦网站MYSQL查询重复记录的方法

时间: 2020-03-14 12:04 阅读: 作者:素材无忧网

1、查找表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断

select * from people   

where peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1) 

 

2、删除表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断,只留有rowid最小的记录  

delete from people   

where peopleId in (select peopleId from people group by peopleId   having count(peopleId) > 1)   

and rowid not in (select min(rowid) from people group by peopleId having count(peopleId )>1)   

 

3、查找表中多余的重复记录(多个字段)

select * from vitae a   

where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1)   

 

4、删除表中多余的重复记录(多个字段),只留有rowid最小的记录

delete from vitae a   

where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1)   

and rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>1)   

 

5、查找表中多余的重复记录(多个字段),不包含rowid最小的记录

select * from vitae a   

where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1)   

and rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>1)   

版权声明: 本站资源均来自互联网或会员发布,如果侵犯了您的权益请与我们联系,我们将在24小时内删除!谢谢!

转载请注明: 织梦网站MYSQL查询重复记录的方法

标签:  
相关文章
模板推荐