oracle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 i
oracle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)