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