题解 | #分组排序练习题#

SELECT university,AVG(question_cnt) FROM user_profile 
GROUP by university
ORDER BY AVG(question_cnt) ASC;

按照平均发帖升序。或者下面这样写法好点

SELECT university,AVG(question_cnt) avg_question_cnt FROM user_profile 
GROUP by university
ORDER BY avg_question_cnt ASC;