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
# 子查询 # select device_id,question_id,result # from question_practice_detail # where device_id=( # select device_id # from user_profile # where university="浙江大学" # ); # 连接查询 # select question_practice_detail.device_id,question_id,result # from question_practice_detail, user_profile # where question_practice_detail.device_id = user_profile.device_id # and user_profile.university = '浙江大学' #内连接查询 select question_practice_detail.device_id,question_id,result from question_practice_detail inner join user_profile on question_practice_detail.device_id = user_profile.device_id and user_profile.university = '浙江大学'