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
https://www.nowcoder.com/practice/4dda66e385c443d8a11570a70807d250
SELECT
c.cust_name,o.order_num,OrderTotal
FROM
Orders as o
JOIN Customers as c ON o.cust_id = c.cust_id
JOIN (SELECT order_num,sum(quantity*item_price) as OrderTotal from OrderItems group by order_num) as i ON o.order_num = i.order_num order by c.cust_name,o.order_num;
先对订单表进行汇总，再连接其他表，最后按名字和订单排序
实习生就是爷，你不把东西做出来，他还能吃了你不成
