Question

我想知道特定订单ID的总价。这些信息包含在这些表格中：

Order_line_t

Order_ID    Product_ID    Quantity
--------    ----------    --------
1006        4             1
1006        5             2
1006        7             2

Uses_t

Product_ID    Material_ID    Footage
----------    -----------    -------
4             16             20
5             15             13
7             10             16

Raw_Materials_t

Material_ID    Unit_Price
-----------    ----------
16             05.70
15             16.72
10             15.55

总费用由

计算

Multiplying SUM ( Order_line_t.Quantity * Uses_t.Footage * Raw_Materials_t.Unit_Price) AS Total

我当前的查询只返回错误：

SELECT Order_line_t.Order_ID, Order_line_t.Product_ID, Uses_t.Product_ID   ,Uses_t.Footage , 
SUM ( Order_line_t.Quantity * Uses_t.Footage * Raw_Materials_t.Unit_Price) AS Total
FROM Order_line_t, Uses_t , Raw_Materials_t
WHERE  Order_line_t.Order_ID = 1006;

帮助表示感谢！我究竟如何加入这些表？我错过了什么？

Answer 1

首先，你错过了表之间的实际连接，其次是你错过了你的小组

SELECT  Order_line_t.Order_ID, 
            Order_line_t.Product_ID, 
            Uses_t.Product_ID   ,
            Uses_t.Footage , 
            SUM ( Order_line_t.Quantity * Uses_t.Footage * Raw_Materials_t.Unit_Price) AS Total
FROM    Order_line_t  INNER JOIN
            Uses_t  ON  Order_line_t.Product_ID = Uses_t.Product_ID INNER JOIN
            Raw_Materials_t     ON  Uses_t.Material_ID = Raw_Materials_t.Material_ID
WHERE   Order_line_t.Order_ID = 1006;
    GROUP BY Order_line_t.Order_ID, 
            Order_line_t.Product_ID, 
            Uses_t.Product_ID   ,
            Uses_t.Footage

修改

试试这个

SELECT Order_line_t.Order_ID, Order_line_t.Product_ID, Uses_t.Product_ID, Uses_t.Footage, Sum([Order_line_t].[Quantity]*[Uses_t].[Footage]*[Raw_Materials_t].[Unit_Price]) AS Total FROM (Order_line_t INNER JOIN Uses_t ON Order_line_t.Product_ID = Uses_t.Product_ID) INNER JOIN Raw_Materials_t ON Uses_t.Material_ID = Raw_Materials_t.Material_ID GROUP BY Order_line_t.Order_ID, Order_line_t.Product_ID, Uses_t.Product_ID, Uses_t.Footage;

修改

按订单ID总计

SELECT Order_line_t.Order_ID, Sum([Order_line_t].[Quantity]*[Uses_t].[Footage]*[Raw_Materials_t].[Unit_Price]) AS Total FROM (Order_line_t INNER JOIN Uses_t ON Order_line_t.Product_ID = Uses_t.Product_ID) INNER JOIN Raw_Materials_t ON Uses_t.Material_ID = Raw_Materials_t.Material_ID GROUP BY Order_line_t.Order_ID;

Answer 2

我认为您需要计算每一行的成本，然后对整个订单求和。类似的东西：

select 
    Order_ID, sum(RowCost) as OrderCost

from (

    select
        o.Order_ID, o.Product_ID, o.Quantity,
        u.Material_ID, u.Footage,
        r.Unit_Price,
        (o.Quantity * u.Footage * r.UnitPrice) as RowCost

    from
        order_line_t o INNER JOIN
        uses_t u on o.Product_ID = u.Product_ID INNER JOIN
        Raw_materials_t r on u.Material_ID = r.Material_ID

    where
        o.Order_ID = 1006

    ) z

group by
    Order_ID

MS Access SQL查询 - 连接3个表以接收总订单价格

2 个答案: