SQL

mysql random

SELECT name
  FROM random AS r1 JOIN
       (SELECT CEIL(RAND() *
                     (SELECT MAX(id)
                        FROM random)) AS id)
        AS r2
 WHERE r1.id >= r2.id
 ORDER BY r1.id ASC
 LIMIT 1

rand mysql

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SELECT f.id FROM files f
      JOIN ( SELECT RAND() * (SELECT MAX(id) FROM files) AS max_id ) AS m
      WHERE f.id >= m.max_id
      ORDER BY f.id ASC
      LIMIT 1;