题解 | #分组计算练习题#
分组计算练习题
http://www.nowcoder.com/practice/009d8067d2df47fea429afe2e7b9de45
SELECT gender,university,COUNT(*) 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 gender,university;
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