1、查詢表中重復數據。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、查詢表中重復數據。select * from people where peopleId in (select peopleId from people group ...
表名:hztj 字段名:edxzqhdm ,sdxzqhdm 1.查出某一列數據中重復的,以sdxzqhdm為例 select * from hztj a where (a.sdxzqhdm) in (select sdxzqhdm from hztj group by sdxzqhdm ...
sql查詢數據庫表中重復數值 -- 查詢表中id重復的值select id from 表名 group by id having count(*) > 1 --查詢表中的重復記錄,重復記錄是根據id重復做判定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) ...
在數據庫中某表中,存在着些相同的記錄,如何能用SQL語句,刪除掉重復的呢1、查找表中多余的重復記錄,重復記錄是根據單個字段(peopleId)來判斷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. 查詢SQL表中某個字段的重復數據 HAVING是分組(GROUP BY)后的篩選條件,分組后的數據組內再篩選;WHERE 則是在分組前篩選。 WHERE 子句中不能使用聚集函數,而 HAVING 子句中可以,所以在集合函數中加上了 HAVING ...