题解 | #分组过滤练习题#
分组过滤练习题
http://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;
having过滤条件
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