先给出结果: select gender, university, count(id) 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 gender,university 分析:1、性别和大学分组:group by gender,university2、计数count(id)3、平均数求30天内和发帖(保留一位小数并四舍五入)round(avg(active_days_wit...