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
qd.difficult_level,
sum(if(qpd.result = 'right', 1, 0)) / count(qpd.question_id) as correct_rate
from
user_profile as u
inner join question_practice_detail as qpd on u.device_id = qpd.device_id
and u.university = '浙江大学'
inner join question_detail as qd on qd.question_id = qpd.question_id
group by difficult_level
order by correct_rate
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