查询数据库中重复记录的方法

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)

一、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)

二、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)

三、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)

四、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)

五、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)