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  • Oracle查询重复数据并删除,只保留一条记录

    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)

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  • 原文地址:https://www.cnblogs.com/liuhai35/p/5407054.html
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