T-SQL 总和答案

【问题标题】：T-SQL SUM TotalT-SQL 总和
【发布时间】：2012-10-16 03:08:34
【问题描述】：

下面我有一个 T-SQL 查询，它返回购买商品的数量、折扣和总数 - 按购买月/年分组。如何更新查询以返回总计行我可以在哪里加总列中的金额？能够将所有行加起来会很好，但我的主要项目是我需要能够得到一个总计。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)

【问题讨论】：

标签： sql sql-server tsql sql-server-2000

【解决方案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)

或者您可以使用与此类似的UNION ALL，其中第二个查询获取不带GROUP BY 的总数：

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

【讨论】：

对不起，我忘了说我使用的是 SQL Server 2000，可以做汇总功能吗？
如果sql-server 2000，则需要使用第二个版本。
我尝试了 UNION ALL 方法，但出现语法错误：关键字“UNION”附近的语法不正确。