使用oracle删除表中重复记录
Posted 清-华-园
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(1)使用用rowid方法
查询重复数据:select * from person a where rowid !=(select max(rowid) from person b where a.cardid=b.cardid and a.pname=b.pname);
删除重复数据:delete from person a where rowid !=(select max(rowid) from person b where a.cardid=b.cardid and a.pname=b.pname);
(2)使用group by方法
查询重复数据:select * from person where cardid in (select cardid from person group by cardid having count(cardid)>1);
删除重复数据:delete from person where cardid in (select cardid from person group by cardid having count(cardid)>1) and rowid not in (select min(rowid) from person group by cardid having count(cardid)>1);
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