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
http://www.nowcoder.com/practice/55f3d94c3f4d47b69833b335867c06c1
1.子查询
select device_id,question_id,result from question_practice_detail where device_id IN (select device_id from user_profile where university = '浙江大学')
2.多表连接
select q.device_id,question_id,result from question_practice_detail q inner join user_profile u on q.device_id = u.device_id where university = '浙江大学'
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