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
o.cust_id,
t.total_ordered
from
Orders o
join (
select
order_num,
sum(item_price * quantity) as total_ordered
from
OrderItems
group by
order_num
) t on o.order_num = t.order_num
order by
t.total_ordered DESC
