题解 | #计算总和#
计算总和
https://www.nowcoder.com/practice/d8a624021183454586da94d280cc8046
select order_num,sum(item_price*quantity) as total_price from OrderItems group by order_num having sum(item_price*quantity)>=1000 order by order_num
- where条件语句后面不能加聚合函数（分组函数）
- having 不能单独使用，必须和group by 联合使用
