1、查询表中重复数据。select * from people where peopleId in (select peopleId from people group ...
select train code,count from tb ask trainbodyroadtrain group by train code having count gt ...
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1、查询表中重复数据。select * from people where peopleId in (select peopleId from people group ...
表名:hztj 字段名:edxzqhdm ,sdxzqhdm 1.查出某一列数据中重复的,以sdxzqhdm为例 select * from hztj a where (a.sdxzqhdm) in (select sdxzqhdm from hztj group by sdxzqhdm ...
sql查询数据库表中重复数值 -- 查询表中id重复的值select id from 表名 group by id having count(*) > 1 --查询表中的重复记录,重复记录是根据id重复做判定select * from 表名 where id in(select id ...
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select * from tablename where id in (select id from tablename group by id having count(id) > 1) ...
在数据库中某表中,存在着些相同的记录,如何能用SQL语句,删除掉重复的呢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 peoplewhere peopleId in (select peopleId from people group ...
select user_id from dt_orders where datatype=10 and status=3 group by user_id having count(*)>1 ...
1. 查询SQL表中某个字段的重复数据 HAVING是分组(GROUP BY)后的筛选条件,分组后的数据组内再筛选;WHERE 则是在分组前筛选。 WHERE 子句中不能使用聚集函数,而 HAVING 子句中可以,所以在集合函数中加上了 HAVING ...