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(if(result ='right',1,0))/count(b.question_id) as correct_rate from question_practice_detail b inner join user_profile a on b.device_id = a.device_id inner join question_detail c on b.question_id = c.question_id where university = "浙江大学" group by difficult_level order by correct_rate
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