题解 | #分组过滤练习题#
分组过滤练习题
https://www.nowcoder.com/practice/ddbcedcd9600403296038ee44a172f2d
select
e.university,
round (avg(e.question_cnt) , 3) as avg_question_cnt,
round (avg(e.answer_cnt) , 3) as avg_answer_cnt
from
user_profile e
group by
e.university
having avg(e.question_cnt) < 5 or avg(e.answer_cnt) <20
where用于筛选原有字段，having用于筛选新建字段
#mysql##sql练习日常#