SQL19 分组过滤练习题

原题链接

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

【注】

聚合函数结果作为筛选条件时，不能用 where，而是用 having