题解 | #返回每个顾客不同订单的总金额#
返回每个顾客不同订单的总金额
http://www.nowcoder.com/practice/ce313253a81c4947b20e801cd4da7894
select cust_id,total_ordered
from (
select order_num,sum(item_price*quantity) as total_ordered
from OrderItems
group by order_num
)as oo inner join Orders as orde on oo.order_num=orde.order_num
order by total_ordered desc
