Oracle中怎样查询,删除一张表中的重复数据

发布网友 发布时间：2022-04-08 10:01

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懂视网 时间：2022-04-08 14:23

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)
关键看什么字段相同算重复，如果是arrearmain_id、reladdr、addrsourcetype的话，那这样写是最高效的，因为用了rowid: delete from cncc_customeraddr_tab t where t.rowid > (select min(x.rowid)   from cncc_customeraddr_tab x   where x.arrearmain_id = t.arrearmain_id   and x.reladdr = t.reladdr   and x.addrsourcetype = t.addrsourcetype)   and t.addrsourcetype = ‘1300000001‘

转自：http://www.cnblogs.com/wjlstation/archive/2012/06/20/2555832.html

oracle删除同一张表的重复记录

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