SQL重复记录查询的几种方法

2023年2月1日 240次阅读 来源: 海贼之路飞

参考文章：
http://database.51cto.com/art/201011/235159.htm

1，查找表中多余的重复记录，重复记录是根据单个字段来判断

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，查找表中对于的重复记录（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），只保留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)
    原文作者：海贼之路飞
    原文地址: https://www.jianshu.com/p/1035a974435f
    本文转自网络文章，转载此文章仅为分享知识，如有侵权，请联系博主进行删除。
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