如何從多個表中選擇多個列以及總成本？

Question

我有四張桌子，但爲此我只需要三張桌子，我想要顯示不在任何表格中但需要計算的客戶，orderid，productid，數量和總成本？到目前爲止，我還設法得到它爲一個訂單與訂單ID顯示總成本，但我希望它顯示上述

訂購提到的所有列：

order_id(primary key) 
customer_id(foreign key) 

訂單項目：

orderid(fk) + productid(fk) (pk) 
quantity 

產品：

productid(pk) 
price 

我所做的是

select orderid, sum(rowcost) as totalcost 
    from (select o.quantity, o.productid, o.orderid, os.customerid, p.price, 
       (o.quantity * p.price) as rowcost 
     from orderline o 
       inner join order os 
         on o.orderid = os.orderid 
       inner join product p 
         on p.productid = o.productid 
     where productid = 123) 
group by orderid; 

現在，我想這與產品ID，客戶ID，TOTALCOST，訂單ID和數量一起顯示所有orderids。該清單應遵循customerid訂單。

我該怎麼做？

當我在select中添加更多變量時，它給了我錯誤。我嘗試了很多方法，但都沒有成功。

Answer 1

你的意思是你想是這樣的：

select o.quantity, o.productid, o.orderid, os.customerid, p.price, 
     (o.quantity * p.price) as rowcost, 
     sum(o.quantity * p.price) over (partition by os.customerid) as totalcost 
    from orderline o 
     inner join order os 
       on o.orderid = os.orderid 
     inner join product p 
       on p.productid = o.productid 
where p.productid = 123 

或本，以保持和正確的，如果你想在一個產品之後過濾

select * 
    from (select o.quantity, o.productid, o.orderid, os.customerid, p.price, 
       (o.quantity * p.price) as rowcost, 
       sum(o.quantity * p.price) over (partition by os.customerid) as totalcost 
      from orderline o 
       inner join order os 
         on o.orderid = os.orderid 
       inner join product p 
         on p.productid = o.productid) 
where productid = 123--or just remove this where clause 

小提琴：http://sqlfiddle.com/#!4/3103d/1