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
http://www.nowcoder.com/practice/d8a4f7b1ded04948b5435a45f03ead8c
select difficult_level,avg(if(result='right',1,0)) correct_rate from (user_profile up left join question_practice_detail qpd on up.device_id=qpd.device_id) right join question_detail qd on qpd.question_id=qd.question_id where university='浙江大学' group by qd.difficult_level order by correct_rate
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