题解 | 浙大不同难度题目的正确率
浙大不同难度题目的正确率
https://www.nowcoder.com/practice/d8a4f7b1ded04948b5435a45f03ead8c
select qu.difficult_level, avg(if(q.result='right',1,0)) as correct_rate from user_profile u join question_practice_detail q on u.device_id=q.device_id join question_detail qu on q.question_id=qu.question_id where u.university='浙江大学' group by qu.difficult_level order by correct_rate asc;