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 qd.difficult_level,sum(if(result='right',1,0))/count(result) as correct_rate from question_practice_detail as qpd join user_profile as up on qpd.device_id =up.device_id and up.university='浙江大学' join question_detail as qd on qpd.question_id = qd.question_id group by qd.difficult_level order by correct_rate
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