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(case when result='right' then 1 else 0 end )/count(result))as correct_rate from question_detail qd,question_practice_detail qpd,user_profile up where qd.question_id=qpd.question_id and qpd.device_id=up.device_id and university='浙江大学' group by difficult_level order by correct_rate
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