题解 | #分组过滤练习题#

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"