SQL重复记录查询的几种方法,需要的朋友可以参考一下
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
代码如下:
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
代码如下:
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)
代码如下:
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
代码如下:
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)文章来源:https://www.toymoban.com/news/detail-662675.html
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
代码如下:
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)
转自:微点阅读 https://www.weidianyuedu.com文章来源地址https://www.toymoban.com/news/detail-662675.html
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