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Oracle 删除重复数据只留一条

时间:2021-07-01 10:21:17 帮助过:29人阅读

查询及删除重复记录的SQL语句   1、查找表中多余的重复记录,重复记录是根据单个字段(Id)来判断   select * from 表 where Id in (select Id from 表 group byId having count(Id) > 1)   2、删除表中多余的重复记录,重复记录是根据单个字段(Id)来判断,只留有rowid最小的记录   DELETE from 表 WHERE (id) IN ( SELECT id FROM 表 GROUP BY id HAVING COUNT(id) > 1) AND ROWID NOT IN (SELECT MIN(ROWID) FROM 表 GROUP BY id HAVING COUNT(*) > 1);   3、查找表中多余的重复记录(多个字段)   select * from 表 a where (a.Id,a.seq) in(select Id,seq from 表 group by Id,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 表 a where (a.Id,a.seq) in (select Id,seq from 表 group by Id,seq having count(*) > 1) and rowid not in (select min(rowid) from 表 group by Id,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 表 a where (a.Id,a.seq) in (select Id,seq from 表 group by Id,seq having count(*) > 1) and rowid not in (select min(rowid) from 表 group by Id,seq having count(*)>1)     标签: Oracle

Oracle 删除重复数据只留一条

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