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(device_id) 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; //GROUP BY 分组
