I need some help with this

SELECT * FROM gallery2 WHERE topic_id="504000" UNION SELECT * FROM gallery2 WHERE topic_id="891887" UNION SELECT * FROM gallery2 WHERE topic_id="1622828" UNION SELECT * FROM gallery2 WHERE topic_id="456947" UNION SELECT * FROM gallery2 WHERE topic_id="360134" UNION SELECT * FROM gallery2 WHERE topic_id="1170424" UNION SELECT * FROM gallery2 WHERE topic_id="420" UNION SELECT * FROM gallery2 WHERE topic_id="568648" UNION SELECT * FROM gallery2 WHERE topic_id="1680733" UNION SELECT * FROM gallery2 WHERE topic_id="558070" UNION SELECT * FROM gallery2 WHERE topic_id="1039495" UNION SELECT * FROM gallery2 WHERE topic_id="1554766" UNION SELECT * FROM gallery2 WHERE topic_id="1206589" UNION SELECT * FROM gallery2 WHERE topic_id="152634" UNION SELECT * FROM gallery2 WHERE topic_id="421901" UNION SELECT * FROM gallery2 WHERE topic_id="1189026"