题解 | 分组过滤练习题
分组过滤练习题
https://www.nowcoder.com/practice/ddbcedcd9600403296038ee44a172f2d
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 avg_question_cnt < 5 or avg_answer_cnt < 20
聚合函数结果作为筛选条件时，不能用where，而是用having语法
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