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 Orders as a, (select order_num, sum(item_price*quantity) as total_ordered from OrderItems group by order_num) as b where a.order_num = b.order_num order by total_ordered desc
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