题解 | 分组过滤练习题
分组过滤练习题
https://www.nowcoder.com/practice/ddbcedcd9600403296038ee44a172f2d
select
university,
round(avg(question_cnt), 3) as avg_question_cnt,
round(avg(answer_cnt), 3) as avg_answer_cnt
from
user_profile
group by
university
having
avg_question_cnt<5
or
avg_answer_cnt<20;
group by 中不能使用别名，必须基于原始列
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