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(qpd.result='right',1,0))/count(result) as correct_rate
from question_practice_detail qpd
Left join question_detail qd
on qpd.question_id=qd.question_id
where device_id in (select device_id
from user_profile
where university = '浙江大学')
group by difficult_level
Order by correct_rate
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