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(b.question_id) as correct_rate from question_practice_detail a left join question_detail b on a.question_id=b.question_id where device_id in (select device_id from user_profile where university='浙江大学') group by b.difficult_level order by correct_rate asc;
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