--- 浙江大学学生做了哪些题目 SELECT university, q.device_id, question_id, result FROM question_practice_detail q, user_profile u WHERE u.device_id = q.device_id AND university = '浙江大学'; --- 加上难度级别信息 SELECT university, q.device_id, q.question_id, difficult_level, result FROM question_practice_detail q, user...