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
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select difficult_level,sum(if(result='right',1,0))/count(q1.question_id) correct_rate
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from user_profile u
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inner join question_practice_detail q1
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on u.device_id = q1.device_id
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inner join question_detail q2
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on q1.question_id = q2.question_id
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where university = '浙江大学'
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group by difficult_level
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order by correct_rate
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