在MYSQL中創建查詢

Question

我需要創建一個查詢，以返回來自（州QLD）的所有客戶的firstName，lastName。併購買產品 - 產品名稱，類別，價格和庫存可用性，但不包含productID。我可以創建簡單的查詢，但沒有那麼複雜。

-Orders(orderID, ordertypeID, customerID, quantity, purchasedate) 

-Customers(customer_ID, state, postcode, street_Number, street_Address, customer_Ln, customer_Fn) 

-Order_Contents(orderID, productID, quantity) 

-Products(product_ID, product_Category, product_Name, product_Description, unit_Price, in_Stock) 

-Categories(categoryName, employeeID) 

Answer 1

你只需要做的表的簡單JOIN像下面

select c.customer_Ln, c.customer_Fn, 
p.product_Category, p.product_Name, 
p.product_Description, p.unit_Price, p.in_Stock 
from customers c 
left join orders o on c.customerID = o.customerID 
left join Order_Contents oc on o.orderID = oc.orderID 
left join Products p on p.productID = oc.productID 
where c.State = 'QLD';