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)avg_question_cnt, round(avg(answer_cnt),3) avg_answer_cnt from user_profile group by university having avg(question_cnt)<5 or avg(answer_cnt)<20 //本题考查聚合函数的用法使用having 而不适用 where
