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一张数据表,存在重复数据.sElECt ID,NAmE,COUNT(...

select ID, count(Name) from A group by ID having count(Name) > 1

1、查出表中重复列的数据:select a,count(*) from table group by a having count(*)>1 2、查重复次数最多的列:select a,num from (select a,count(*) num from table group by a having count(*)>1)order by num desc 此外,还有 1、查询一个...

不会是id都相同吧 select A from 表 group by A having count(A)>1 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 cou...

--假设表名为sales (销售) --,含有字段product (产品) ; select product , count(*) from sales group by product ; --如果还有流水号id,可以: select product , count(*) --不去重 , count(distinct id) --去重 from sales group by product ;

试试下面的语句: delete 表 where (select count(1) from 表 as a where a.filename=表.filename and a.filetime>=表.filetime)>3

sql 单表/多表查询去除重复记录 单表distinct 多表group by group by 必须放在 order by 和 limit之前,不然会报错 ********************...

方法有很多,这里介绍两种 方法一、如果要保留id的最小值,例如: 数据:执行sql:select count(*) as count ,name,id from ceshi group by name<img 最后要删除的sql为:delete from ceshi where id not in (select count(*) as count ,n...

select name,count(1)from tabnamegroup by namehaving count(1) > 1

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...

--查询指定条件下的重复次数--测试数据with tabname(id,name) as (select 1,'name1' union allselect 1,'name1' union allselect 1,'name1' union allselect 1,'name2' union allselect 1,'name2' union allselect 1,'name3' union allselect 2,...

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