如何在SQL Server中获得此列的总和

问题描述

| 我在下面的查询中使用订单号来获取我的数据...

SELECT     Details.Quantity,Details.OrderNumber,Orders.OrderDate,Products.ProductName,Products.UnitPrice,Details.Quantity*Products.UnitPrice as qprice
FROM       Details 
INNER JOIN Orders 
   ON Details.OrderNumber = Orders.OrderNumber 
INNER JOIN Products 
   ON Details.ProductID = Products.ProductID
where Orders.OrderNumber=\'14195\'

这个查询给我下面的结果 现在我想给qprice列总和。 我怎样才能做到这一点？？     

解决方法

        像这样？

SELECT SUM(Details.Quantity * Products.UnitPrice) AS Amount
FROM Details 
    INNER JOIN Orders ON 
        Details.OrderNumber = Orders.OrderNumber
    INNER JOIN Products ON 
        Details.ProductID = Products.ProductID
WHERE Orders.OrderNumber = \'14195\'

如果您需要将TotalAmount作为现有内容的额外列，请执行以下操作：

SELECT    
    Details.Quantity,Details.OrderNumber,Orders.OrderDate,Products.ProductName,Products.UnitPrice,Details.Quantity*Products.UnitPrice as qprice,SUM(Details.Quantity*Products.UnitPrice) OVER() TotalAmount
FROM Details 
    INNER JOIN Orders ON 
        Details.OrderNumber = Orders.OrderNumber
    INNER JOIN Products ON 
        Details.ProductID = Products.ProductID
WHERE Orders.OrderNumber = \'14195\'