Need some help with this thing

SELECT * FROM gallery2 WHERE topic_id="1790575" UNION SELECT * FROM gallery2 WHERE topic_id="1170627" UNION SELECT * FROM gallery2 WHERE topic_id="693172" UNION SELECT * FROM gallery2 WHERE topic_id="715966" UNION SELECT * FROM gallery2 WHERE topic_id="290247" UNION SELECT * FROM gallery2 WHERE topic_id="803704" UNION SELECT * FROM gallery2 WHERE topic_id="1013301" UNION SELECT * FROM gallery2 WHERE topic_id="1301323" UNION SELECT * FROM gallery2 WHERE topic_id="537653" UNION SELECT * FROM gallery2 WHERE topic_id="27715" UNION SELECT * FROM gallery2 WHERE topic_id="1012111" UNION SELECT * FROM gallery2 WHERE topic_id="602828" UNION SELECT * FROM gallery2 WHERE topic_id="387089" UNION SELECT * FROM gallery2 WHERE topic_id="784207" UNION SELECT * FROM gallery2 WHERE topic_id="1605838" UNION SELECT * FROM gallery2 WHERE topic_id="8911"