题解 | #分组过滤练习题#

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;

#书写顺序 序号是执行顺序
(8) SELECT (9) DISTINCT 
(1) FROM 
(3)  JOIN 
(2)    ON 
(4) WHERE 
(5) GROUP BY 
(6) WITH {CUBE|ROLLUP} 
(7) HAVING 
(10) ORDER BY 
(11) LIMIT