select e.university, round (avg(e.question_cnt) , 3) as avg_question_cnt, round (avg(e.answer_cnt) , 3) as avg_answer_cnt from user_profile e group by e.university having avg(e.question_cnt) < 5 or avg(e.answer_cnt) <20 where用于筛选原有字段，having用于筛选新建字段
