题解 | #分组计算练习题#

分组计算练习题

http://www.nowcoder.com/practice/009d8067d2df47fea429afe2e7b9de45

Just AVG! :(

SELECT gender, university, 
    COUNT(*) 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
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