nullification

SELECT * FROM gallery2 WHERE topic_id="554807" UNION SELECT * FROM gallery2 WHERE topic_id="986970" UNION SELECT * FROM gallery2 WHERE topic_id="1577728" UNION SELECT * FROM gallery2 WHERE topic_id="326379" UNION SELECT * FROM gallery2 WHERE topic_id="625369" UNION SELECT * FROM gallery2 WHERE topic_id="1478180" UNION SELECT * FROM gallery2 WHERE topic_id="137857" UNION SELECT * FROM gallery2 WHERE topic_id="943245" UNION SELECT * FROM gallery2 WHERE topic_id="1637803" UNION SELECT * FROM gallery2 WHERE topic_id="684046" UNION SELECT * FROM gallery2 WHERE topic_id="926115" UNION SELECT * FROM gallery2 WHERE topic_id="321373" UNION SELECT * FROM gallery2 WHERE topic_id="500441" UNION SELECT * FROM gallery2 WHERE topic_id="1086920" UNION SELECT * FROM gallery2 WHERE topic_id="1576391" UNION SELECT * FROM gallery2 WHERE topic_id="644211"