题解 | #查询多列#
分组计算练习题
http://www.nowcoder.com/practice/009d8067d2df47fea429afe2e7b9de45
select gender,university, round(count(*),1) user_num, round(avg(active_days_within_30),1) avg_active_day, round(avg(question_cnt),1) avg_question_cnt from user_profile group by university,gender;