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 t2.result='right' then 1 else 0 end)/count(result) as correct_rate FROM user_profile t1 join question_practice_detail t2 on t1.device_id=t2.device_id join question_detail t3 on t2.question_id=t3.question_id where university='浙江大学' group by difficult_level order by correct_rate
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