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,avg(if(qp.result='right', 1, 0)) correct_rate from user_profile u,question_practice_detail qp,question_detail qd where u.device_id = qp.device_id and qp.question_id = qd.question_id and university = '浙江大学' group by difficult_level order by correct_rate
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