SQl 根据某列去重 partition by

 

主键为ID

select * from [infotops] where Id in (select max(id) from [infotops] group by InfoId) 

 

 

----------------------------------------------------- 巩固----------------------------------------------

group by 

 

PARTITION BY  看图比较区别

SELECT ROW_NUMBER() OVER ( PARTITION BY Infoid order by id desc) rowNum ,
*
FROM [InfoTops] t1 with(nolock)  ---》

 

with infos as
(
SELECT ROW_NUMBER() OVER ( PARTITION BY Infoid order by id desc) rowNum ,
*
FROM [InfoTops] t1 with(nolock)
)
select * from infos where rowNum=1   ---------------》