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 Orders.cust_id,T1.total_ordered from Orders left join (select order_num,sum(item_price*quantity) as total_ordered from OrderItems group by order_num) as T1 on T1.order_num=Orders.order_num order by total_ordered DESC
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