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