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(device_id) 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;
最后一行 group by 表示是按照 后面属性的组合建立新表查询
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