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 t3.difficult_level,sum(case when t2.result="right" then 1 else 0 end)/count(t2.question_id) 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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