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(1),
avg(active_days_within_30),
avg(question_cnt)
from
user_profile
group by
university,gender;
记录一下分组时 , university,gender
