題解 | #分組計(jì)算練習(xí)題#
分組計(jì)算練習(xí)題
http://www.fangfengwang8.cn/practice/009d8067d2df47fea429afe2e7b9de45
select gender,university,count(gender) 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 university,gender;