题解 | 分组过滤练习题
分组过滤练习题
https://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
- 表头重命名：as
- 用having不用where
- 按学校输出,
group by university
