oracle 查询重复数据以及删除重复数据

最新推荐文章于 2023-08-09 16:48:37 发布

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本文介绍了如何在Oracle数据库中查询并删除重复数据，确保表中只保留唯一记录。

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<span style="font-family:Courier New;font-size:18px;">select a.facilityid,
              a.faulttime,
              a.domainid,
              a.facilitytype1,
              a.facilitytype2,
              a.facilitytype3,
              count(*)
         from ips_fault_facility a
        group by a.facilityid,
                 a.faulttime,
                 a.domainid,
                 a.facilitytype1,
                 a.facilitytype2,
                 a.facilitytype3 having count(*) > 1</span>

<span style="font-family:Courier New;font-size:18px;">create table ips_fault_facility1
as
select *
  from ips_fault_facility a
 where rowid <> (select min(rowid)
                   from ips_fault_facility b
                  where a.facilityid = b.facilityid
                    and a.faulttime = b.faulttime
                    and a.domainid = b.domainid
                    and a.facilitytype1 = b.facilitytype1
                    and a.status = b.status
                    and a.facilitytype2 = b.facilitytype2
                    and a.facilitytype3 = b.facilitytype3)</span>

--删除重复数据

<span style="font-family:Courier New;font-size:18px;">delete from ips_fault_facility a where exists(select 1 from ips_fault_facility1 b where a.uuid = b.uuid)</span>

Oracle 删除重复数据只留一条

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)