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 c.difficult_level as difficult_level ,round(sum(if(a.result = 'right',1 ,0)) / count(a.device_id), 4) as correct_rate from question_practice_detail a left join user_profile b on a.device_id = b.device_id left join question_detail c on a.question_id = c.question_id where university = '浙江大学' group by c.difficult_level order by correct_rate
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