题解 | #分组过滤练习题#
分组过滤练习题
http://www.nowcoder.com/practice/ddbcedcd9600403296038ee44a172f2d
university,
avg(question_cnt) avg_question_cnt,
avg(answer_cnt) avg_answer_cnt
from
user_profile
group by
university
having
avg_question_cnt < 5
or avg_answer_cnt < 20
// select 里有函数则条件用having不用where
