找出仓库中占用最多space的商品类型

Question

我有这样的查询

select StockId, ProductType, sum(ProductVolume) as ProductTypeVolume
from myTable
where InStock = 1
group by StockId, ProductType

结果是这样的

StockId	ProductType	ProductTypeVolume
10	Type1	65
10	Type2	25
10	Type3	45
20	Type2	80
20	Type4	60
20	Type5	20

我需要得到一个结果，其中有两行，每个 StockId，具有最大的 ProductTypeVolume，如下所示

StockId	ProductType	ProductTypeVolume
10	Type1	65
20	Type2	80

Answer 1

您需要 CTE、subquery 和 group by：

WITH t
     AS (SELECT stockid,
                producttype,
                Sum(productvolume) AS ProductTypeVolume
         FROM   mytable
         WHERE  instock = 1
         GROUP  BY stockid,
                   producttype)


SELECT A.stockid,
       B.producttype,
       A.producttypevolume
FROM   (SELECT stockid,
               Max(producttypevolume) ProductTypeVolume
        FROM   t
        GROUP  BY stockid) A
       JOIN t B
         ON A.stockid = B.stockid
            AND A.producttypevolume = B.producttypevolume

您可以使用row_number如下

SELECT TOP(2) stockid,
              producttype,
              producttypevolume
--,ROW_NUMBER() OVER (PARTITION BY StockId ORDER BY ProductTypeVolume DESC)
FROM   t
ORDER  BY Row_number()
            OVER (
              partition BY stockid
              ORDER BY producttypevolume DESC) ASC

找出仓库中占用最多space的商品类型

Find the type of goods that takes up the most space in the warehouse

sql

sql-server

select

sum

max