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

# from 
# join 
# on 
# where 
# group by(开始使用select中的别名,后面的语句中都可以使用)
# avg,sum.... 
# having 
# select 
# distinct 
# order by
# limit 

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