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(result = 'right') / count(*) correct_rate
from
user_profile up
join question_practice_detail qpd on up.device_id = qpd.device_id
join question_detail qd on qpd.question_id = qd.question_id
where university = '浙江大学'
group by difficult_level
order by correct_rate asc
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