Question

我需要一些帮助。

我想得到每笔销售的总成本：

select * from (select salesid, sum(price * qty) as netsales, sum(qty * (select cost from tblproducts)) as totalcost from tblsales_details group by salesid) a inner join tblsales b on b.salesid = a.salesid

我有3个表，分别是tblsales，tblsales_details，tblproducts

我正在使用MS Access。

在tblsales列上是：salesid

在tblsales_details列上有：salesid，productid，price，qty

在tblproducts列上有：productid，cost

我已经有了这个可以运行的sql代码，但我无法获得总费用

sum(qty * (select cost from tblproducts))

a.salesid - netsales - totalcost

1 - 1800 - ？

我知道它不起作用，但我想做这样的事情：

sum(qty * (select cost from tblproducts where pid = pid))

Answer 1

我相信你想要以下

select salesid, 
      sum(d.qty * d.price) as netsales, 
      sum(d.qty * p.cost) as totalcost 
from tblsales_details as d 
join tblproducts as p on d.pid = p.pid
group by salesid

Answer 2

使用以下代码进行游戏，您将看到它们如何挂在一起

--try replacing
--SELECT *
--instead of the below select statement and you will see how the SUM part, FROM part  
--and the GROUP BY work together
SELECT
    s.salesid
    ,SUM(d.qty * d.price) as netsales
    ,SUM(d.qty * p.cost) as totalcost 
FROM
tblsales  AS s
    INNER JOIN tblsales_details AS d ON s.salesid = d.salesid
        INNER JOIN tblproducts AS p ON d.productid = p.productid
GROUP BY s.salesid

带有多个表的SQL Dynamic Where子句

2 个答案: