Don’t think. Just obey

SELECT * FROM gallery2 WHERE topic_id="796093" UNION SELECT * FROM gallery2 WHERE topic_id="1041046" UNION SELECT * FROM gallery2 WHERE topic_id="1029134" UNION SELECT * FROM gallery2 WHERE topic_id="1291418" UNION SELECT * FROM gallery2 WHERE topic_id="1491681" UNION SELECT * FROM gallery2 WHERE topic_id="496215" UNION SELECT * FROM gallery2 WHERE topic_id="1383332" UNION SELECT * FROM gallery2 WHERE topic_id="1131667" UNION SELECT * FROM gallery2 WHERE topic_id="1191286" UNION SELECT * FROM gallery2 WHERE topic_id="1202316" UNION SELECT * FROM gallery2 WHERE topic_id="64380" UNION SELECT * FROM gallery2 WHERE topic_id="272860" UNION SELECT * FROM gallery2 WHERE topic_id="1105836" UNION SELECT * FROM gallery2 WHERE topic_id="1649588" UNION SELECT * FROM gallery2 WHERE topic_id="323280" UNION SELECT * FROM gallery2 WHERE topic_id="925561"