题解 | #出现三次以上相同积分的情况#
出现三次以上相同积分的情况
http://www.nowcoder.com/practice/c69ac94335744480aa50646864b7f24d
搞了个子查询，有点麻烦了
SELECT
g.number
FROM
grade g JOIN
(
SELECT
id, COUNT(number) count_num
FROM grade
GROUP BY number
)a ON g.id=a.id
WHERE
a.count_num>=3
;