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 difficult_level, count(if(t2.result="right",1,null))/count(t2.question_id) as correct_rate from user_profile t1 inner join question_practice_detail t2 on t1.device_id = t2.device_id inner join question_detail t3 on t3.question_id = t2.question_id where university="浙江大学" group by t3.difficult_level order by correct_rate asc
