题解 | #返回顾客名称和相关订单号以及每个订单的总价#
返回顾客名称和相关订单号以及每个订单的总价
http://www.nowcoder.com/practice/4dda66e385c443d8a11570a70807d250
order_num 两个表都有，需要指明使用的是哪个表
SELECT cust_name, Orders.order_num, SUM(quantity * item_price) AS OrderTotal
FROM Customers
INNER JOIN Orders on Customers.cust_id=Orders.cust_id
INNER JOIN OrderItems on OrderItems.order_num=Orders.order_num
GROUP BY cust_name, Orders.order_num
ORDER BY cust_name, Orders.order_num;
或者可用Using 声明
SELECT cust_name, order_num, SUM(quantity * item_price) AS OrderTotal
FROM Customers
INNER JOIN Orders using(cust_id)
INNER JOIN OrderItems using(order_num)
GROUP BY cust_name, order_num
ORDER BY cust_name, order_num;
