我們如何將GROUP BY中的列與內部聯接進行分組？

Question

我會附上截圖，請看看：

在此，我需要根據每個獲得[本地貨幣]的總和各分行名稱

SELECT 
    BR.BranchName [BRANCH NAME], 
    PDS.ProductName [CURRENCY], 
    SUM(FCBD.Quantity) [QUANTITY], 
    FCBD.BuyingRate [RATE], 
    SUM(CONVERT(DECIMAL(12, 3), (FCBD.Quantity * FCBD.BuyingRate))) [LOCAL CURRENCY], 
    0 [TOTAL] 
FROM 
    ALX_FCBuy FCB 
INNER JOIN 
    ALX_FCBuyDetails FCBD ON FCB.FCBuyID = FCBD.FCBuyID 
INNER JOIN 
    ALX_Branches BR ON FCB.BranchID = BR.BranchID     
INNER JOIN 
    ALX_Products PDS ON FCBD.ProductID = PDS.ProductID 
GROUP BY 
    BR.BranchName, FCBD.ProductID, PDS.ProductName, FCBD.BuyingRate 

Answer 1

SELECT 
BR.BranchName [BRANCH NAME], 
PDS.ProductName [CURRENCY], 
SUM(FCBD.Quantity) [QUANTITY], 
FCBD.BuyingRate [RATE], 
SUM(CONVERT(DECIMAL(12, 3), (FCBD.Quantity * FCBD.BuyingRate))) [LOCAL CURRENCY], 
SUM(SUM(CONVERT(DECIMAL(12, 3), FCBD.Quantity * FCBD.BuyingRate))) OVER (PARTITION BY BR.BranchName) [TOTAL] 
FROM 
ALX_FCBuy FCB 
INNER JOIN 
ALX_FCBuyDetails FCBD ON FCB.FCBuyID = FCBD.FCBuyID 
INNER JOIN 
ALX_Branches BR ON FCB.BranchID = BR.BranchID     
INNER JOIN 
ALX_Products PDS ON FCBD.ProductID = PDS.ProductID 
GROUP BY 
BR.BranchName, FCBD.ProductID, PDS.ProductName, FCBD.BuyingRate 

Answer 2

如果您需要總和爲每個分支，那麼只有放進了SELECT和GROUP BY：

SELECT BR.BranchName [BRANCH NAME], 
     SUM(CONVERT(DECIMAL(12, 3), FCBD.Quantity * FCBD.BuyingRate)) [LOCAL CURRENCY], 
FROM ALX_FCBuy FCB INNER JOIN 
    ALX_FCBuyDetails FCBD 
    ON FCB.FCBuyID = FCBD.FCBuyID INNER JOIN 
    ALX_Branches BR 
    ON FCB.BranchID = BR.BranchID INNER JOIN 
    ALX_Products PDS 
    ON FCBD.ProductID = PDS.ProductID 
GROUP BY BR.BranchName; 

如果你想在你現有的結果集額外列，則計算將使用窗口功能：

SELECT . . . 
     SUM(SUM(CONVERT(DECIMAL(12, 3), FCBD.Quantity * FCBD.BuyingRate))) OVER (PARTITION BY BR.BranchName) as Total 
. . .