题解 | #分组过滤练习题#
分组过滤练习题
https://www.nowcoder.com/practice/ddbcedcd9600403296038ee44a172f2d
-- having用于聚合函数的筛选， where中不能使用聚合函数 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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