题解 | #分组过滤练习题#
分组过滤练习题
http://www.nowcoder.com/practice/ddbcedcd9600403296038ee44a172f2d
select * from ( select if(avg(question_cnt) < 5 or avg(answer_cnt) < 20, university, null) as university, avg(question_cnt) as avg_question_cnt, avg(answer_cnt) as avg_answer_cnt from user_profile group by university ) t1 where university is not null
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