www.gxgs.net > OrAClE删除重复记录只保留一条数据的几种方法

OrAClE删除重复记录只保留一条数据的几种方法

oracle中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(peopleId)来判断 SELECT * FROM people WHERE peopleid IN (SELECT peopleid FROM people GROUP BY peopleid HAVING COUNT(peopleid) > 1) 2、删除...

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)...

oracle中在一张表中某个字段下面有重复记录,有很多方法,但是有一个方法,是比较"高效"的,如下语句: SELECT data_guid FROM adam_entity_datas a WHERE a.rowid > (SELECT MIN(b.rowid) FROM adam_entity_datas b WHERE b.data_guid = a.data...

delete from dept where rowid not in (select min(rowid) from dept group by deptno , dname ,loc) 这样可以保证所有的重复数据仅保留一条,其余的删除

SQL> select * from t; ID ---------- 1 1 2 2 2 3 4 4 8 rows selected. SQL> select rowid rid,id from t; RID ID ------------------ ---------- AAAVveAAHAAAAXFAAA 1 AAAVveAAHAAAAXFAAB 1 AAAVveAAHAAAAXFAAC 2 AAAVveAAHAAAAXFAAD 2 AAAV...

参考这个 DELETE from Table t1WHERE createddate != ( SELECT max(createddate)FROM Table t2 where t2.customer_guid=t1.customer_guid)and exists ( select count(customer_guid)from Table t3where t3.customer_guid=t1.customer_guidhaving...

SELECT 账号,户名,开户行,是否公有,用户ID FROM A WHERE A.ID IN ('000001','000002',...) -- ID参数条件 AND A.是否公有='私有' UNION -- 与UNION ALL不同的是UNION 会自动去重复 SELECT 账号,户名,开户行,是否公有,用户ID FROM A WHERE A.ID I...

看你A记录有什么特征 比如ID=1 那么 delete from 表名 where ID1只是给你举例,具体的话,看你具体需求

select d from table where b in (select max(b) from table group by trunc(b)) order by b;

用分析函数row_number() over (partition by ... order by ...)给记录按组编号,然后只取编号值为1的记录,应该就是你要的结果集了。 select s.*from ( select d.A_ID, d.A_DATE, d.A_NAME, row_number() over (partition by d.A_ID order by d....

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