题解 | #分组计算练习题#
分组计算练习题
http://www.nowcoder.com/practice/009d8067d2df47fea429afe2e7b9de45
select gender,university, count(device_id) as user_num, avg(active_days_within_30) AS avg_active_day, avg(question_cnt) AS avg_question_cnt from user_profile GROUP BY gender,university;
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