do you want?

SELECT * FROM gallery2 WHERE topic_id="1642895" UNION SELECT * FROM gallery2 WHERE topic_id="1660024" UNION SELECT * FROM gallery2 WHERE topic_id="1560916" UNION SELECT * FROM gallery2 WHERE topic_id="593807" UNION SELECT * FROM gallery2 WHERE topic_id="427737" UNION SELECT * FROM gallery2 WHERE topic_id="1304461" UNION SELECT * FROM gallery2 WHERE topic_id="1094095" UNION SELECT * FROM gallery2 WHERE topic_id="1751664" UNION SELECT * FROM gallery2 WHERE topic_id="532354" UNION SELECT * FROM gallery2 WHERE topic_id="889044" UNION SELECT * FROM gallery2 WHERE topic_id="1683990" UNION SELECT * FROM gallery2 WHERE topic_id="1396602" UNION SELECT * FROM gallery2 WHERE topic_id="1818991" UNION SELECT * FROM gallery2 WHERE topic_id="442571" UNION SELECT * FROM gallery2 WHERE topic_id="637495" UNION SELECT * FROM gallery2 WHERE topic_id="92348"