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,#这两项信息只需要查询,无计算
count(device_id) as user_num,
avg(active_days_within_30) as avg_activate_days,
avg(question_cnt) as avg_question_cnt#这三项需要进行相应的处理
from user_profile
group by gender,university#最后以学校和性别来分组

