题解 | #分组计算练习题#
分组计算练习题
https://www.nowcoder.com/practice/009d8067d2df47fea429afe2e7b9de45
/* 学校+性别分类 用户数,平均活跃天数,平均发帖子数量*/ select gender, university, count(id) as user_num, round(avg(active_days_within_30),1) as avg_active_day, round(avg(question_cnt),1) as avg_question_cnt from user_profile group by gender,university