查詢問題在SQL Server 2008中

Question

我試圖開發返回以下查詢：

1. 單元，每個單元產品銷往
2. 產品的名稱
3. 的CustomerID總量買了每個產品

此的最大數量是我到目前爲止有：

SELECT DISTINCT 
    Products.ProductName, 
    SUM([Order Details].Quantity) as cant, 
    Orders.CustomerID  
FROM 
    Products 
INNER JOIN [Order Details] 
    ON Products.ProductID = [Order Details].ProductID 
INNER JOIN Orders 
    ON [Order Details].OrderID = Orders.OrderID 
WHERE 
    [Order Details].Quantity = 
    (
     SELECT 
     MAX([Order Details].Quantity) 
     FROM 
     [Order Details] 
     WHERE 
     [Order Details].ProductID = Products.ProductID 
) 
GROUP BY 
    Products.ProductName, Orders.CustomerID 

它沒有給我預期的結果。

任何與表格或其他內容相關的信息，只需將它發佈在評論中，我會回答。

在此先感謝您的幫助！

Answer 1

試試這個，

;WITH orderCTE AS 
( SELECT p.ProductName, 
      o.CustomerID, 
      SUM(od.Quantity) [Quantity] 
    FROM Products p 
      INNER JOIN [Order Details] od 
       ON od.ProductID = p.ProductID 
      INNER JOIN Orders o 
       ON o.OrderID = od.OrderID 
    GROUP BY p.ProductName, o.CustomerID 
) 
SELECT ProductName, [TotalQuantity], CustomerID 
FROM ( SELECT CustomerID, 
        ProductName, 
        Quantity, 
        MAX(Quantity) OVER(PARTITION BY ProductName) [MaxQuantity], 
        SUM(Quantity) OVER(PARTITION BY ProductName) [TotalQuantity] 
      FROM orderCTE 
     ) ord 
WHERE MaxQuantity = Quantity 

編輯

以上將返回副本如果不止一個客戶有順序的相同產品的最多數量。

;WITH orderCTE AS 
( SELECT p.ProductName, 
      o.CustomerID, 
      SUM(od.Quantity) [Quantity] 
    FROM Products p 
      INNER JOIN [Order Details] od 
       ON od.ProductID = p.ProductID 
      INNER JOIN Orders o 
       ON o.OrderID = od.OrderID 
    GROUP BY p.ProductName, o.CustomerID 
), MaxOrdersCTE AS 
( SELECT CustomerID, 
      ProductName, 
      Quantity, 
      MAX(Quantity) OVER(PARTITION BY ProductName) [MaxQuantity], 
      SUM(Quantity) OVER(PARTITION BY ProductName) [TotalQuantity] 
    FROM orderCTE 
) 

SELECT ProductName, 
     [TotalQuantity], 
     STUFF((SELECT ';' + CONVERT(VARCHAR, CustomerID) 
      FROM MaxOrdersCTE c 
      WHERE ord.ProductName = c.Productname 
      AND  MaxQuantity = Quantity 
      FOR XML PATH('') 
     ), 1, 1, '') [CustomerIDs] 
FROM MaxOrdersCTE ord 
WHERE MaxQuantity = Quantity 

Answer 2

試試這個

SELECT DISTINCT 
    p.ProductName, 
    SUM(od.Quantity) as cant, 
    o.CustomerID  
FROM 
    Products p 
    INNER JOIN [Order Details] od 
    ON p.ProductID = od.ProductID 
    CROSS APPLY (
     SELECT 
     MAX(Quantity) Quantity 
     FROM 
     [Order Details] 
     WHERE 
     ProductID = p.ProductID 
    ) mq 
    INNER JOIN [Order Details] fod 
    ON od.ProductID = fod.ProductID 
    AND mq.Quantity = fod.Quantity 
    INNER JOIN Orders o 
    ON fod.OrderID = o.OrderID 
GROUP BY 
    p.ProductName, o.CustomerID