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,total_ordered
from(
select order_num,sum(quantity*item_price) total_ordered
from OrderItems
group by order_num
order by total_ordered desc
)tmp
join Orders O on tmp.order_num=O.order_num
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