题解 | #分组过滤练习题#
分组过滤练习题
http://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;
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