How do you compare :)

SELECT * FROM gallery2 WHERE topic_id="1705605" UNION SELECT * FROM gallery2 WHERE topic_id="1579459" UNION SELECT * FROM gallery2 WHERE topic_id="1331105" UNION SELECT * FROM gallery2 WHERE topic_id="1089720" UNION SELECT * FROM gallery2 WHERE topic_id="1675351" UNION SELECT * FROM gallery2 WHERE topic_id="281155" UNION SELECT * FROM gallery2 WHERE topic_id="67624" UNION SELECT * FROM gallery2 WHERE topic_id="1161405" UNION SELECT * FROM gallery2 WHERE topic_id="1363955" UNION SELECT * FROM gallery2 WHERE topic_id="443784" UNION SELECT * FROM gallery2 WHERE topic_id="1224838" UNION SELECT * FROM gallery2 WHERE topic_id="496987" UNION SELECT * FROM gallery2 WHERE topic_id="1708104" UNION SELECT * FROM gallery2 WHERE topic_id="78355" UNION SELECT * FROM gallery2 WHERE topic_id="1011601" UNION SELECT * FROM gallery2 WHERE topic_id="1180143"