查找每天热销产品的产品id，根据总销售数量确定热销产品

Question

Adventureworks2008R2 数据库。

我想要的结果是每天卖出的最大数量，例如，OrderDate 2007-09-01 的最大数量应该只有 96，但是我的查询在同一天给了我 3 个不同的结果，可能是因为它也在考虑时间戳

SELECT DISTINCT CAST(oh.OrderDate AS DATE) OrderDate, (od.ProductID),SUM(od.OrderQty) MAXOrderQty
FROM Sales.SalesOrderDetail od
Inner Join Sales.SalesOrderHeader oh
ON od.SalesOrderID = oh.SalesOrderID
GROUP BY od.ProductID, CAST(oh.OrderDate AS DATE), od.OrderQty
ORDER BY SUM(od.OrderQty) DESC

Answer 1

使用 window 函数解决此类问题要容易得多。在这种情况下，rank 应该可以解决问题：

SELECT OrderDate, ProductID, MaxOrderQty
FROM   (SELECT OrderDate, ProductID, MaxOrderQty,
               RANK() OVER (PARTITION BY OrderDate ORDER BY MaxOrderQty DESC) AS rk
        FROM   Sales.SalesOrderDetail) s
WHERE  rk = 1

Answer 2

您可以在 MAX 数量 date

上写 CTE 和自己 JOIN

;WITH CTE(OrderDate,ProductID,MAXOrderQty) AS(
    SELECT  CAST(oh.OrderDate AS DATE) OrderDate,od.ProductID,SUM(od.OrderQty) MAXOrderQty
    FROM Sales.SalesOrderDetail od
    Inner Join Sales.SalesOrderHeader oh
    ON od.SalesOrderID = oh.SalesOrderID
    GROUP BY od.ProductID, CAST(oh.OrderDate AS DATE)
)
SELECT t1.* 
FROM CTE t1 INNER JOIN (
    select OrderDate,MAX(MAXOrderQty) 'MAXOrderQty'
    from CTE 
    GROUP BY OrderDate
)t2 on t1.OrderDate = t2.OrderDate and t1.MAXOrderQty = t2.MAXOrderQty

查找每天热销产品的产品id，根据总销售数量确定热销产品

Find product id of the top selling product of each day, using total sold quantity to determine the top selling product

sql

sql-server

select

adventureworks