这是所需的选择：
select t1.PLAYER_id, t1.FRIEND_ID from tablename t1inner join tablename t2 on t1.PLAYER_id = t2.FRIEND_ID and t2.PLAYER_id = t1.FRIEND_ID
这是所需的选择：
select t1.PLAYER_id, t1.FRIEND_ID from tablename t1inner join tablename t2 on t1.PLAYER_id = t2.FRIEND_ID and t2.PLAYER_id = t1.FRIEND_ID
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