Dense

SELECT * FROM gallery2 WHERE topic_id="86051" UNION SELECT * FROM gallery2 WHERE topic_id="1590195" UNION SELECT * FROM gallery2 WHERE topic_id="969237" UNION SELECT * FROM gallery2 WHERE topic_id="1108405" UNION SELECT * FROM gallery2 WHERE topic_id="1812129" UNION SELECT * FROM gallery2 WHERE topic_id="1621894" UNION SELECT * FROM gallery2 WHERE topic_id="839774" UNION SELECT * FROM gallery2 WHERE topic_id="954511" UNION SELECT * FROM gallery2 WHERE topic_id="26388" UNION SELECT * FROM gallery2 WHERE topic_id="559426" UNION SELECT * FROM gallery2 WHERE topic_id="788218" UNION SELECT * FROM gallery2 WHERE topic_id="1587387" UNION SELECT * FROM gallery2 WHERE topic_id="194200" UNION SELECT * FROM gallery2 WHERE topic_id="811646" UNION SELECT * FROM gallery2 WHERE topic_id="1214762" UNION SELECT * FROM gallery2 WHERE topic_id="1636780"