MYSQL查询两个表里相同的数据

select * from (select * from a union all select * from b) T where name in (select name from a  where name in( select name from b))

已经经过测试。

select * from 表 where n_id in

(select s_name from 表

group by s_name,n_money,s_zhipiao,s_date,s_lixi

having count(s_name)>1)

你是要查找数据库中某个字段下的相同数据吧，我给你写2个例子

(数据库执行效率高)

select * from dbo.MediafileInfo as a where

(VideoDownUrl IN (SELECT VideoDownUrl FROM MediafileInfo AS B WHERE A.ProgramID <>B.ProgramID))

(数据库执行效率低)

SELECT *

FROM MediafileInfo AS A

WHERE (SELECT COUNT(*) FROM MediafileInfo WHERE VideoDownUrl=A.VideoDownUrl)>1

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