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我的項目是關於一家珠寶店,我試圖找到每個產品類別的利潤。 讓我更具體如何找到類別的利潤
我有3個表,給了我的信息:
SALES(salesid,產品ID,數量,價格)
salesid productid Quantity Price
11001 13001 4 5
11002 13002 6 10
11003 13003 5 16
.
.
11012 13012 7 15
RETURN(salesid,產品ID,日期,數量,價格)
salesid productid Quantity Price
11003 13003 1 16
11007 13007 3 12
11008 13008 3 8
採購(procurementid,產品ID,數量,價格)
procurementid productid Quantity Price
100001 13001 10 2
100002 13002 10 2
.
.
100012 13012 10 2
PRODUCT_CATEGORY(類別ID,類別)
categoryid category
1 Gold
2 Silver
.
5 Platin
產品(產品ID,類別ID)
Productid categoryid
13001 1
13002 3
.
.
13010 5
利潤從這種類型給出:
Profit=Quantity*Price(Sell)-Quantity*Price(Return)-Quantity*Price(Procurement)
喏,這就是問題..我到這個目前爲止
SELECT categoryid,
category,
(coalesce(a.rev,0)- coalesce(b.ret,0),
coalesce(c.cost,0)) AS profit
FROM product category AS g
JOIN product AS h ON g.categoryid = h.categoryid
JOIN
(SELECT categoryid,
sum(quantity*price) AS rev
FROM sales AS a,
product AS b
WHERE a.productid = b.productid
GROUP BY categoryid) a
LEFT OUTER JOIN
(SELECT cartegoryid,
sum(quantity*price) AS ret
FROM RETURN AS a ,
product AS b
WHERE a.productid = b.productid
GROUP BY categoryid) b ON a.categoryid = b.categoryid
LEFT OUTER JOIN
(SELECT categoryid,
sum(quantity*price) AS cost
FROM procurement AS a,
product AS b
WHERE a.productid = b.productid
GROUP BY categoryid) c ON a.categoryid = c.categoryid ,
product AS d,
procurement AS e
WHERE MONTH(f.date) = MONTH(e.date)
AND YEAR(date) = 2013
[抱歉對準我是新來的網站不知道如何複製粘貼代碼以及(:d)] wahtever當我做到這一點涉及到一個國家像
categoryid category profit
1 Gold -100
2 Silver -100
.
5 Platin -100
不知道問題在哪裏......我做了很多改變和切換,但沒有出現......任何建議都會如此有用。謝謝你的進步