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
- where和having的使用辨析：where用于筛选原有字段，having用于筛选新建字段。在本题中审题可知应用having进行筛选。
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