在SQL中实现Hacker News排名算法

未经测试：

  SELECt x.*    FROM POSTS x    JOIN (SELECt p.postid,       SUM(v.vote) AS points FROM POSTS p JOIN VOTES v ON v.postid = p.postid        GROUP BY p.postid) y ON y.postid = x.postidORDER BY (y.points - 1)/POW(((UNIX_TIMESTAMP(NOW()) - UNIX_TIMESTAMP(x.timestamp))/3600)+2, 1.5) DESC   LIMIT n