SQL Server - 获取两列产品的最终总和

Question

尽管我对SQL Server知之甚少，但我仍然坚持这个问题一段时间：

我正在尝试获取两列产品的最终总和，但SQL Server无法识别我的上一列。这是查询：

SELECT
Products.customName AS 'Name',
Ordered_Products.scanned AS 'Sent Quantity',
Charged_Products.price AS 'Product Price',
Ordered_Products.scanned * Charged_Products.price AS 'Charged'
FROM Products
    JOIN Charged_Products
        ON Products.productsId = Charged_Products.productsId
    JOIN Ordered_Products
        ON Ordered_Products.productsId = Products.productsId
WHERE
Ordered_Products.ordersId = 500 AND
Ordered_Products.scanned > 0
UNION ALL
SELECT 'TOTAL', '', '', SUM('Charged')

看起来应该是这样的：

有人能指出我正确的方向让查询有效吗？任何帮助将不胜感激。

Answer 1

您最好在客户端执行此操作。

但如果你想要这么多，那就用GROUPING SETS。

SELECT ISNULL (Products.customName, 'TOTAL') AS 'Name'
    , Ordered_Products.scanned AS 'Sent Quantity'
    , Charged_Products.price AS 'Product Price'
    , SUM (Ordered_Products.scanned * Charged_Products.price) AS 'Charged'
FROM Products
INNER JOIN Charged_Products ON Products.productsId = Charged_Products.productsId
INNER JOIN Ordered_Products ON Ordered_Products.productsId = Products.productsId
WHERE Ordered_Products.ordersId = 500
    AND Ordered_Products.scanned > 0
GROUP BY GROUPING SETS ((Products.customName, Ordered_Products.scanned, Charged_Products.price),())

Answer 2

GROUPING SETS是您可能需要的。请检查此sql fiddle

以下应该可以工作，但不是很确定，因为我没有用实际数据检查它。此外，它在性能方面看起来也不太好。

SELECT
Products.customName AS 'Name',
Ordered_Products.scanned AS 'Sent Quantity',
Charged_Products.price AS 'Product Price',
Ordered_Products.scanned * Charged_Products.price AS 'Charged'
FROM Products
JOIN Charged_Products
ON Products.productsId = Charged_Products.productsId
JOIN Ordered_Products
ON Ordered_Products.productsId = Products.productsId
WHERE
Ordered_Products.ordersId = 500 AND
Ordered_Products.scanned > 0
UNION ALL
SELECT 'TOTAL', '', '', SUM(Ordered_Products.scanned * Charged_Products.price)
FROM Products
JOIN Charged_Products
ON Products.productsId = Charged_Products.productsId
JOIN Ordered_Products
ON Ordered_Products.productsId = Products.productsId
WHERE
Ordered_Products.ordersId = 500 AND
Ordered_Products.scanned > 0

希望这有帮助。

Answer 3

你可以这样做：

SELECT
Products.customName AS 'Name',
Ordered_Products.scanned AS 'Sent Quantity',
Charged_Products.price AS 'Product Price',
Ordered_Products.scanned * Charged_Products.price AS 'Charged'
FROM Products
    JOIN Charged_Products
        ON Products.productsId = Charged_Products.productsId
    JOIN Ordered_Products
        ON Ordered_Products.productsId = Products.productsId
WHERE
Ordered_Products.ordersId = 500 AND
Ordered_Products.scanned > 0

UNION ALL

SELECT 'TOTAL', '', '', SUM(Ordered_Products.scanned * Charged_Products.price)
FROM Products
    JOIN Charged_Products
        ON Products.productsId = Charged_Products.productsId
    JOIN Ordered_Products
        ON Ordered_Products.productsId = Products.productsId
WHERE
Ordered_Products.ordersId = 500 AND
Ordered_Products.scanned > 0

Answer 4

DECLARE @TableName TABLE 
    ( [name] varchar(20), [attribute] INT, [value] int)
;

INSERT INTO @TableName
    ( [name], [attribute], [value])
VALUES
    ('Product1', 2, 15),
    ('Product2', 3, 30),
    ('Product3', 3, 20)

select name,attribute,value,attribute * value As Total from @TableName
UNION ALL 
Select 'T0tal','','',SUM(attribute * value)  from @TableName