選擇數據

Question

我有三個表的順序，產品和客戶爲了CUSTOMER_ID和PRODUCT_ID是外鍵，我怎麼會得到訂單記錄的所有列在一個查詢是指客戶的名稱價格，數量總價

Answer 1

使用JOIN

select orders.*, products.*, customers.* 
    from order as orders 
     join product as products 
     on products.id = orders.product_id 
     join customer as customers 
     on customers.id = orders.customer_id 

Answer 2

使用一些查詢與加入如下

SELECT * FROM product p inner join customer c on p.product_id=c.customer_id inner join order o on p.product_id=o.order_id 

或

SELECT customername,price,quantity,totalprice FROM product p inner join customer c on p.product_id=c.customer_id inner join order o on p.product_id=o.order_id