Left or right

SELECT * FROM gallery2 WHERE topic_id="1508397" UNION SELECT * FROM gallery2 WHERE topic_id="664365" UNION SELECT * FROM gallery2 WHERE topic_id="580668" UNION SELECT * FROM gallery2 WHERE topic_id="641819" UNION SELECT * FROM gallery2 WHERE topic_id="223083" UNION SELECT * FROM gallery2 WHERE topic_id="377868" UNION SELECT * FROM gallery2 WHERE topic_id="1114723" UNION SELECT * FROM gallery2 WHERE topic_id="1806249" UNION SELECT * FROM gallery2 WHERE topic_id="971778" UNION SELECT * FROM gallery2 WHERE topic_id="1493249" UNION SELECT * FROM gallery2 WHERE topic_id="293279" UNION SELECT * FROM gallery2 WHERE topic_id="925837" UNION SELECT * FROM gallery2 WHERE topic_id="1693626" UNION SELECT * FROM gallery2 WHERE topic_id="1171079" UNION SELECT * FROM gallery2 WHERE topic_id="233386" UNION SELECT * FROM gallery2 WHERE topic_id="1546930"