题解 | #分组过滤练习题#
分组过滤练习题
https://www.nowcoder.com/practice/ddbcedcd9600403296038ee44a172f2d
SELECT university, avg(question_cnt) as avg_question_cnt, avg(answer_cnt) as avg_answer_cnt from user_profile group by university having avg_question_cnt<5 or avg_answer_cnt<20
having是这样子用的，当时整理知识点的时候不怎么明白，现在实际运用稍微明白了一点点了
