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 ,sum(if(a.result = 'right',1,0)) / count(1) from question_practice_detail a left join user_profile b on a.device_id = b.device_id and b.university = '浙江大学' left join question_detail c on a.question_id = c.question_id where b.device_id is not null group by 1 order by 2
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