Difference

SELECT * FROM gallery2 WHERE topic_id="1457643" UNION SELECT * FROM gallery2 WHERE topic_id="1294162" UNION SELECT * FROM gallery2 WHERE topic_id="1514006" UNION SELECT * FROM gallery2 WHERE topic_id="939295" UNION SELECT * FROM gallery2 WHERE topic_id="691971" UNION SELECT * FROM gallery2 WHERE topic_id="436583" UNION SELECT * FROM gallery2 WHERE topic_id="54570" UNION SELECT * FROM gallery2 WHERE topic_id="1278613" UNION SELECT * FROM gallery2 WHERE topic_id="954720" UNION SELECT * FROM gallery2 WHERE topic_id="1086376" UNION SELECT * FROM gallery2 WHERE topic_id="946426" UNION SELECT * FROM gallery2 WHERE topic_id="662801" UNION SELECT * FROM gallery2 WHERE topic_id="995850" UNION SELECT * FROM gallery2 WHERE topic_id="1548482" UNION SELECT * FROM gallery2 WHERE topic_id="1240415" UNION SELECT * FROM gallery2 WHERE topic_id="644267"