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
left join
解法
select cust_id, sum(item_price * quantity) total_ordered from Orders left join OrderItems using(order_num) group by cust_id order by total_ordered desc;