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(*) as correct_rate from user_profile up join question_practice_detail qpd on qpd.device_id=up.device_id join question_detail qd on qd.question_id=qpd.question_id where university='浙江大学' group by qd.difficult_level ORDER BY correct_rate;
