is this allowed

SELECT * FROM gallery2 WHERE topic_id="1311473" UNION SELECT * FROM gallery2 WHERE topic_id="1504207" UNION SELECT * FROM gallery2 WHERE topic_id="1222561" UNION SELECT * FROM gallery2 WHERE topic_id="903812" UNION SELECT * FROM gallery2 WHERE topic_id="1764030" UNION SELECT * FROM gallery2 WHERE topic_id="810378" UNION SELECT * FROM gallery2 WHERE topic_id="756181" UNION SELECT * FROM gallery2 WHERE topic_id="1063064" UNION SELECT * FROM gallery2 WHERE topic_id="1031685" UNION SELECT * FROM gallery2 WHERE topic_id="17941" UNION SELECT * FROM gallery2 WHERE topic_id="494467" UNION SELECT * FROM gallery2 WHERE topic_id="526456" UNION SELECT * FROM gallery2 WHERE topic_id="346060" UNION SELECT * FROM gallery2 WHERE topic_id="1182373" UNION SELECT * FROM gallery2 WHERE topic_id="1362041" UNION SELECT * FROM gallery2 WHERE topic_id="1300901"