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(university) 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
注意这一题avg的用法,可以在分组内使用avg,注意范围