代码之家 › 专栏 › 技术社区 › Marko

从两个不同的表中计算(数量*价格)的总和

sum sql

Marko · 技术社区 · 15 年前

我有两张桌子如下

PRODUCT 桌子

Id | Name | Price

ORDERITEM 桌子

Id | OrderId | ProductId | Quantity

我在尝试这样的事情

SELECT Id, SUM(Quantity * (select Price from Product where Id = Id)) as qty
FROM OrderItem o
WHERE OrderId = @OrderId

但这当然行不通:)

编辑: 我只想显示整个订单的总计,所以基本上是OrderItem中每行的数量*价格之和。下面是一些示例数据。

表产品

Id     Name            Price  
1      Tomatoes        20.09    
4      Cucumbers       27.72    
5      Oranges         21.13    
6      Lemons          20.05
7      Apples          12.05

Id         OrderId        ProductId        Quantity
151        883            1                22
152        883            4                11
153        883            5                8
154        883            6                62

米

5 回复 | 直到 12 年前

OMG Ponies 15 年前

用途:

  SELECT oi.orderid,
         SUM(oi.quantity * p.price) AS grand_total,
    FROM ORDERITEM oi
    JOIN PRODUCT p ON p.id = oi.productid
   WHERE oi.orderid = @OrderId
GROUP BY oi.orderid

oi.quantity 或 p.price 如果为null,则总和将返回null。

Randy 15 年前

我认为这个-包括空值=0

 SELECT oi.id, 
         SUM(nvl(oi.quantity,0) * nvl(p.price,0)) AS total_qty 
    FROM ORDERITEM oi 
    JOIN PRODUCT p ON p.id = oi.productid 
   WHERE oi.orderid = @OrderId 
GROUP BY oi.id

Matt M 15 年前

我想这正是你想要的。似乎您希望查看订单ID、订单中每个项目的小计以及订单的总金额。

select o1.orderID, o1.subtotal, sum(o2.UnitPrice * o2.Quantity) as order_total from
(
    select o.orderID, o.price * o.qty as subtotal
    from product p inner join orderitem o on p.ProductID= o.productID
    where o.orderID = @OrderId
)as o1
inner join orderitem o2 on o1.OrderID = o2.OrderID
group by o1.orderID, o1.subtotal

Beth 15 年前

select orderID, sum(subtotal) as order_total from
(
    select orderID, productID, price, qty, price * qty as subtotal
    from product p inner join orderitem o on p.id = o.productID
    where o.orderID = @orderID
) t
group by orderID

Alican Dönmez 12 年前

我和马尔科有同样的问题,遇到了这样的解决方案:

/*Create a Table*/
CREATE TABLE tableGrandTotal
(
columnGrandtotal int
)

/*Create a Stored Procedure*/
CREATE PROCEDURE GetGrandTotal
AS

/*Delete the 'tableGrandTotal' table for another usage of the stored procedure*/
DROP TABLE tableGrandTotal

/*Create a new Table which will include just one column*/
CREATE TABLE tableGrandTotal
(
columnGrandtotal int
)

/*Insert the query which returns subtotal for each orderitem row into tableGrandTotal*/
INSERT INTO tableGrandTotal
    SELECT oi.Quantity * p.Price AS columnGrandTotal
        FROM OrderItem oi
        JOIN Product p ON oi.Id = p.Id

/*And return the sum of columnGrandTotal from the newly created table*/    
SELECT SUM(columnGrandTotal) as [Grand Total]
    FROM tableGrandTotal

EXEC GetGrandTotal