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, sum(item_price*quantity) total_ordered from OrderItems a right join Orders b on a.order_num = b.order_num group by cust_id order by sum(item_price*quantity) DESC