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  ROUND(AVG(question_cnt),3) <5 OR ROUND(AVG(answer_cnt),3)	<20;