题解 | 分组过滤练习题
select
university,
round(avg(question_cnt), 3) avg_question_cnt,
round(avg(answer_cnt), 3) avg_answer_cnt
from
user_profile
group by
university
having
avg_question_cnt < 5
or avg_answer_cnt < 20;
select
university,
round(avg(question_cnt), 3) avg_question_cnt,
round(avg(answer_cnt), 3) avg_answer_cnt
from
user_profile
group by
university
having
avg_question_cnt < 5
or avg_answer_cnt < 20;
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