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,sum(if(result='right',1,0))/count(question_id) correct_rate from (select u.device_id,u.university,q.question_id,q.result,d.difficult_level from user_profile u join question_practice_detail q on u.device_id=q.device_id join question_detail d on d.question_id=q.question_id where university='浙江大学')aa group by difficult_level order by correct_rate
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