T-SQL SUM Total

Question

下面我有一个T-SQL查询,它可以带回购买的商品数量,减去折扣和总数 - 按购买月份/年份分组.如何更新查询以返回总计行,我可以在总列中添加金额？能够将所有行添加起来会很好,但我的主要项目是我需要能够获得总计.谢谢.

    Select DATENAME(month, [OrderDate]) + ' ' + CAST(YEAR(OrderDate) AS CHAR(4)) 
    AS [Month],
    SUM(Amount) AS [Amount],
    SUM(Discount1) AS [Discount 1],
    SUM(Discount2) AS [Discount 2],
    SUM(Amount - Discount1 - Discount2) AS [Total]
    From 
    Orders
    JOIN Customer on orders.cust_ky=customer.cust_ky
    GROUP BY DATENAME(month, [OrderDate]) + ' ' + CAST(YEAR(OrderDate) AS CHAR(4))
    ORDER BY MAX(OrderDate)

Answer 1

根据您的sql-server版本,您可能能够实现汇总功能(SQL-Server 2005+):

Select DATENAME(month, [OrderDate]) + ' ' + CAST(YEAR(OrderDate) AS CHAR(4)) AS [Month],
    SUM(Amount) AS [Amount],
    SUM(Discount1) AS [Discount 1],
    SUM(Discount2) AS [Discount 2],
    SUM(Amount - Discount1 - Discount2) AS [Total]
From Orders
JOIN Customer 
    on orders.cust_ky=customer.cust_ky
GROUP BY ROLLUP(DATENAME(month, [OrderDate]) + ' ' + CAST(YEAR(OrderDate) AS CHAR(4)))
ORDER BY MAX(OrderDate)

或者您可以使用UNION ALL与此类似的内容,其中第二个查询获得总数而不使用GROUP BY:

Select DATENAME(month, [OrderDate]) + ' ' + CAST(YEAR(OrderDate) AS CHAR(4)) AS [Month],
    SUM(Amount) AS [Amount],
    SUM(Discount1) AS [Discount 1],
    SUM(Discount2) AS [Discount 2],
    SUM(Amount - Discount1 - Discount2) AS [Total]
From Orders
JOIN Customer 
    on orders.cust_ky=customer.cust_ky
GROUP BY DATENAME(month, [OrderDate]) + ' ' + CAST(YEAR(OrderDate) AS CHAR(4))
union all
Select 'Total',
    SUM(Amount) AS [Amount],
    SUM(Discount1) AS [Discount 1],
    SUM(Discount2) AS [Discount 2],
    SUM(Amount - Discount1 - Discount2) AS [Total]
From Orders
JOIN Customer 
    on orders.cust_ky=customer.cust_ky