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
http://www.nowcoder.com/practice/d8a4f7b1ded04948b5435a45f03ead8c
select c.difficult_level,sum(case when b.result='right' then 1 else 0 end)/count(b.result) correct_rate from user_profile a inner join question_practice_detail b on a.device_id=b.device_id inner join question_detail c on b.question_id=c.question_id where a.university='浙江大学' group by c.difficult_level order by correct_rate asc;
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