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 t2.cust_id,sum(t1.quantity*t1.item_price) total_ordered from OrderItems t1,Orders t2 where t1.order_num=t2.order_num group by t2.cust_id order by total_ordered desc