Let’s get a ranking system here

SELECT * FROM gallery2 WHERE topic_id="648986" UNION SELECT * FROM gallery2 WHERE topic_id="1254564" UNION SELECT * FROM gallery2 WHERE topic_id="491156" UNION SELECT * FROM gallery2 WHERE topic_id="440778" UNION SELECT * FROM gallery2 WHERE topic_id="355695" UNION SELECT * FROM gallery2 WHERE topic_id="1330395" UNION SELECT * FROM gallery2 WHERE topic_id="1567950" UNION SELECT * FROM gallery2 WHERE topic_id="1477570" UNION SELECT * FROM gallery2 WHERE topic_id="935382" UNION SELECT * FROM gallery2 WHERE topic_id="48608" UNION SELECT * FROM gallery2 WHERE topic_id="954770" UNION SELECT * FROM gallery2 WHERE topic_id="901718" UNION SELECT * FROM gallery2 WHERE topic_id="1620505" UNION SELECT * FROM gallery2 WHERE topic_id="1534231" UNION SELECT * FROM gallery2 WHERE topic_id="1703963" UNION SELECT * FROM gallery2 WHERE topic_id="1790069"