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 t3.difficult_level,
round(sum(if(t2.result='right',1,0))/count(t2.question_id),4) as correct_rate
from user_profile t1,question_practice_detail t2,question_detail t3
where t1.device_id = t2.device_id and t2.question_id = t3.question_id and t1.university='浙江大学'
group by t3.difficult_level
order by correct_rate asc
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