I know many tricks

SELECT * FROM gallery2 WHERE topic_id="872852" UNION SELECT * FROM gallery2 WHERE topic_id="571255" UNION SELECT * FROM gallery2 WHERE topic_id="1766524" UNION SELECT * FROM gallery2 WHERE topic_id="1302241" UNION SELECT * FROM gallery2 WHERE topic_id="1762991" UNION SELECT * FROM gallery2 WHERE topic_id="571455" UNION SELECT * FROM gallery2 WHERE topic_id="518910" UNION SELECT * FROM gallery2 WHERE topic_id="118812" UNION SELECT * FROM gallery2 WHERE topic_id="122817" UNION SELECT * FROM gallery2 WHERE topic_id="1534923" UNION SELECT * FROM gallery2 WHERE topic_id="111200" UNION SELECT * FROM gallery2 WHERE topic_id="1524340" UNION SELECT * FROM gallery2 WHERE topic_id="1473498" UNION SELECT * FROM gallery2 WHERE topic_id="1777907" UNION SELECT * FROM gallery2 WHERE topic_id="833639" UNION SELECT * FROM gallery2 WHERE topic_id="1015096"