Wet approach

SELECT * FROM gallery2 WHERE topic_id="856906" UNION SELECT * FROM gallery2 WHERE topic_id="1132106" UNION SELECT * FROM gallery2 WHERE topic_id="1719012" UNION SELECT * FROM gallery2 WHERE topic_id="1377961" UNION SELECT * FROM gallery2 WHERE topic_id="1801652" UNION SELECT * FROM gallery2 WHERE topic_id="1176431" UNION SELECT * FROM gallery2 WHERE topic_id="1052811" UNION SELECT * FROM gallery2 WHERE topic_id="297635" UNION SELECT * FROM gallery2 WHERE topic_id="1274389" UNION SELECT * FROM gallery2 WHERE topic_id="108416" UNION SELECT * FROM gallery2 WHERE topic_id="908221" UNION SELECT * FROM gallery2 WHERE topic_id="1408047" UNION SELECT * FROM gallery2 WHERE topic_id="657647" UNION SELECT * FROM gallery2 WHERE topic_id="28378" UNION SELECT * FROM gallery2 WHERE topic_id="413372" UNION SELECT * FROM gallery2 WHERE topic_id="495458"