题解 | #分组过滤练习题#
浙江大学用户题目回答情况
http://www.nowcoder.com/practice/55f3d94c3f4d47b69833b335867c06c1
SELECT user_profile.device_id,question_id,result
FROM question_practice_detail
INNER JOIN user_profile
ON question_practice_detail.device_id = user_profile.device_id
where university='浙江大学'
user_profile和question_practice_detail表中的device_id会混淆，要区分开
