题解 | #分组计算练习题#
分组计算练习题
https://www.nowcoder.com/practice/009d8067d2df47fea429afe2e7b9de45
select gender,university,count(gender)as usr_num,avg(active_days_within_30) avg_active_day,avg(question_cnt) avg_question_cnt from user_profile group by gender, university 这里用到了分组,主要是给gender和university分组