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
https://www.nowcoder.com/practice/ce313253a81c4947b20e801cd4da7894
select cust_id,(
select sum(item_price*quantity)
from OrderItems a where a.order_num = b.order_num) as total_ordered
from Orders b
order by total_ordered desc
