题解 | #分组过滤练习题#
分组过滤练习题
https://www.nowcoder.com/practice/ddbcedcd9600403296038ee44a172f2d
select university, sum(question_cnt)/count(device_id) as avg_question_cnt, sum(answer_cnt)/count(device_id) avg_answer_cnt from user_profile
group by university
having avg_question_cnt < 5 or avg_answer_cnt < 20
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