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题解 | #浙江大学用户题目回答情况#

select device_id,question_id,result from question_practice_detailwhere device_id=(SELECT device_id from user_profile where university = '浙江大学')order b...

2021-08-26

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题解 | #SQL18 分组计算练习题

SELECT gender,university,COUNT(gender),avg(active_days_within_30)as avg_active_days,avg(question_cnt)as question_cnt from user_profileGROUP by gender,...

2021-08-26

7 1419