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(result) correct_rate from question_practice_detail a,user_profile b,question_detail c where a.device_id=b.device_id and a.question_id=c.question_id and university='浙江大学' group by difficult_level order by correct_rate
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