Question

我在SQL sproc中有一个临时表（用于搜索），列是ProductID，CategoryID和WeightRank。

从这张表中我需要获得具有最高WeightRank的CategoryID。我很难弄清楚语法，任何帮助都会受到赞赏。

注意：临时表有许多具有相同CategoryID的产品，我需要找到每个唯一CategoryID的组合WeightRank并返回[最高排名] CategoryID。（希望这有道理吗？）

Answer 1

select top 1 categoryID
from #t
group by categoryID
order by sum(WeightRank) desc

或者avg(WeightRank)？

Answer 2

标准SQL解决方案允许多个类别绑定最大

SELECT *
FROM 
table  t
INNER JOIN 
(
     SELECT
              SUM( WeightRank) weightRank, category_id 
    FROM 
       table t
    GROUP  by
       category_id 
) sumRank
ON t.category_id  = sumrank.category_id 
INNER JOIN 

SELECT  MAX(weightRank) weightRank
FROM (     
    SELECT
              SUM( WeightRank) weightRank, category_id 
    FROM 
       table t
    GROUP  by
       category_id 
) maxRank

ON sumRank.weightRank= maxRank.weightRank

选择排名最高的类别SQL

2 个答案: