SQL Server 数据库中查询及删除重复记录的方法

发布时间：2023-02-17 09:53:29 所属栏目：MsSql 来源：互联网

导读：图文解释查询及删除重复记录的方法 1、查找表(people)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(people)

　　图文解释
　　查询及删除重复记录的方法

　　1、查找表(people)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(people)中多余的重复记录，重复记录是根据单个字段（peopleId）来判断，只留字段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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