?

主鍵為ID

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

?

?

----------------------------------------------------- 鞏固----------------------------------------------

group by?

?

PARTITION BY ?看圖比較區別

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 ? ---------------》

?

?

轉載于:https://www.cnblogs.com/kunlunmountain/p/4502342.html

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