题解 | #查看学校名称中含北京的用户#
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;
