题解 | #分组过滤练习题#
分组过滤练习题
https://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 having与where 1）where是对分组前数据进行过滤 2）having是对分组后的数据进行过滤
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