nullification

SELECT * FROM gallery2 WHERE topic_id="875012" UNION SELECT * FROM gallery2 WHERE topic_id="1446234" UNION SELECT * FROM gallery2 WHERE topic_id="336129" UNION SELECT * FROM gallery2 WHERE topic_id="1013440" UNION SELECT * FROM gallery2 WHERE topic_id="1406487" UNION SELECT * FROM gallery2 WHERE topic_id="671190" UNION SELECT * FROM gallery2 WHERE topic_id="1050036" UNION SELECT * FROM gallery2 WHERE topic_id="139973" UNION SELECT * FROM gallery2 WHERE topic_id="1455797" UNION SELECT * FROM gallery2 WHERE topic_id="1345941" UNION SELECT * FROM gallery2 WHERE topic_id="1024651" UNION SELECT * FROM gallery2 WHERE topic_id="678123" UNION SELECT * FROM gallery2 WHERE topic_id="254520" UNION SELECT * FROM gallery2 WHERE topic_id="801044" UNION SELECT * FROM gallery2 WHERE topic_id="1703614" UNION SELECT * FROM gallery2 WHERE topic_id="1796673"