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 (result = 'right', 1, 0)) / count(1) correct_rate
from
question_practice_detail qpd
left join user_profile up on qpd.device_id = up.device_id
left 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;
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