Select Books.Category, Books.Retail,
Round(Orderitems.Quantity * (Books.Retail - Books.Cost),0) AS Category_Profit
From Books
INNER JOIN Orderitems
ON BOOKS.Retail=ORDERITEMS.Paideach
Group by Books.Category, Books.Retail
我要做的是显示每个类别的类别和总利润。涉及两个表
Books Table = Category & Retail & Cost
Orderitems Table= Quantity & Paid each
所以例如Category
Sports = Football, Basketball
Food = Chicken, Beef
结果将显示足球+篮球的零售价格在一个类别中,另一行将显示鸡肉+牛肉作为一个
两个表之间的关系是零售=每个支付 还试图将Category_Profit的值四舍五入到最接近的完整值。
我收到ORA-00979的错误:第2行没有GROUP BY表达式
答案 0 :(得分:2)
听起来您只需按category
分组,而不是retail
分组。但是,您需要将sum
聚合函数用于其他值:
Select Books.Category,
sum(Books.Retail),
Round(sum(Orderitems.Quantity * (Books.Retail - Books.Cost)),0) AS Category_Profit
From Books
INNER JOIN Orderitems
ON BOOKS.Retail=ORDERITEMS.Paideach
Group by Books.Category