SQL19题解 | #分组过滤练习题#
分组过滤练习题
https://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;
#聚合函数作为筛选条件不能用WHERE,该用HAVING
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