题解 | #分组过滤练习题#
分组过滤练习题
https://www.nowcoder.com/practice/ddbcedcd9600403296038ee44a172f2d
select t.university,t.avg_question_cnt,t.avg_answer_cnt
from(
select university,avg(question_cnt) as avg_question_cnt,avg(answer_cnt) as avg_answer_cnt
from user_profile
group by university
)t
where t.avg_question_cnt<5 or t.avg_answer_cnt<20
#不命名为t之类的话，会编译错误
#也可以用having
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