题解 | #分组过滤练习题#
分组过滤练习题
http://www.nowcoder.com/practice/ddbcedcd9600403296038ee44a172f2d
select university, round(avg(question_cnt),3) as avg_question_cnt , round(avg(answer_cnt ),3) as avg_answer_cnt from user_profile group by university having avg_question_cnt < 5 or avg_answer_cnt <20
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