题解 | #作答试卷得分大于过80的人的用户等级分布#
作答试卷得分大于过80的人的用户等级分布
https://www.nowcoder.com/practice/5bc77e3a3c374ad6a92798f0ead4c744
select level,count(uid) level_cnt from user_info where uid in (select uid from exam_record where exam_id in (select exam_id from examination_info ei where tag = "SQL") and score > 80) group by level order by level_cnt desc