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(quantity*item_price) as total_ordered from (select o.cust_id,oi.quantity,oi.item_price from OrderItems oi inner join Orders o on oi.order_num=o.order_num)as subquery group by cust_id order by total_ordered desc
先连接表，再筛选
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