SQL | 计算总和

计算总和_牛客题霸_牛客网 (nowcoder.com)https://www.nowcoder.com/practice/d8a624021183454586da94d280cc8046?tpId=298&tqId=2374683&ru=/exam/oj&qru=/ta/sql-teach-yourself/question-ranking&sourceUrl=%2Fexam%2Foj%3Fpage%3D1%26tab%3DSQL%25E7%25AF%2587%26topicId%3D298

select order_num, sum((item_price * quantity)) total_price from OrderItems
group by order_num
having total_price >= 1000 
order by order_num

注意产品有重复的，要加sum()函数。