602. 好友申请 II ：谁有最多的好友

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题目链接：602. 好友申请 II ：谁有最多的好友

代码如下：

# Write your MySQL query statement below
select ids as id,count(*) as num
from (select requester_id as idsfrom RequestAcceptedunion all select accepter_id as idsfrom RequestAccepted
) as t
group by ids
order by num desc
limit 1