数据库查重复记录

数据库查重复记录

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)
注意：这里的重复是指所有列的数据相同

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)

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)

6、查询表某列的重复数据

select name from people group by name having count(name) > 1

总结

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