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
1、先通过OrderItems计算得到每个订单的汇总表 2、用汇总表和其他三张表相连接，得到最终表
select cust_name,o.order_num,OrderTotal from
(select order_num,sum(quantity*item_price) OrderTotal from OrderItems
group by order_num ) t
join Orders o
on t.order_num = o.order_num
join Customers c
on o.cust_id = c.cust_id
order by cust_name,o.order_num
