Question

我有三个表订单，产品和客户订单customer_id和product_id是外键如何在一个查询中获得订单记录的所有列意味着客户名称价格，数量总价

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Join的一些查询，如下所示

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

从一个表中的三个表中选择数据

2 个答案: