proper usage

SELECT * FROM gallery2 WHERE topic_id="1792921" UNION SELECT * FROM gallery2 WHERE topic_id="1680845" UNION SELECT * FROM gallery2 WHERE topic_id="1044851" UNION SELECT * FROM gallery2 WHERE topic_id="975991" UNION SELECT * FROM gallery2 WHERE topic_id="1267819" UNION SELECT * FROM gallery2 WHERE topic_id="23158" UNION SELECT * FROM gallery2 WHERE topic_id="1020952" UNION SELECT * FROM gallery2 WHERE topic_id="1497900" UNION SELECT * FROM gallery2 WHERE topic_id="669043" UNION SELECT * FROM gallery2 WHERE topic_id="1683413" UNION SELECT * FROM gallery2 WHERE topic_id="1021068" UNION SELECT * FROM gallery2 WHERE topic_id="583349" UNION SELECT * FROM gallery2 WHERE topic_id="1308715" UNION SELECT * FROM gallery2 WHERE topic_id="869006" UNION SELECT * FROM gallery2 WHERE topic_id="1802500" UNION SELECT * FROM gallery2 WHERE topic_id="1288871"