题解 | #浙江大学用户题目回答情况#
浙江大学用户题目回答情况
https://www.nowcoder.com/practice/55f3d94c3f4d47b69833b335867c06c1
select q.device_id, question_id, result from question_practice_detail as q, user_profile as u where q.device_id = u.device_id and university = '浙江大学'; 两个表中有相同的字段,数据库不知道如何区分,所以前面要加上表名