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Oracle

2024-08-22 00:52:57   222人阅读

去除表中存在的重复数据：
DELETE from 表 WHERE (cert_no) IN
( SELECT cert_no FROM 表 GROUP BY cert_no HAVING COUNT(cert_no) > 1)
 AND ROWID NOT IN (SELECT MIN(ROWID) FROM 表 GROUP BY cert_no HAVING COUNT(*) > 1);
 
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)
 

Oracle


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