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查询数据库中重复记录的方法

2024-07-12 18:14:58   225人阅读

select * from [DataBase].[dbo].[TableName]  where [字段一] in (select [字段一] from [DataBase].[dbo].[TableName]  group by [字段一] having count([字段一]) > 1)

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)


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