Join

SELECT * FROM gallery2 WHERE topic_id="1640540" UNION SELECT * FROM gallery2 WHERE topic_id="901285" UNION SELECT * FROM gallery2 WHERE topic_id="1374784" UNION SELECT * FROM gallery2 WHERE topic_id="1232738" UNION SELECT * FROM gallery2 WHERE topic_id="1395794" UNION SELECT * FROM gallery2 WHERE topic_id="1313585" UNION SELECT * FROM gallery2 WHERE topic_id="1159333" UNION SELECT * FROM gallery2 WHERE topic_id="2685" UNION SELECT * FROM gallery2 WHERE topic_id="420972" UNION SELECT * FROM gallery2 WHERE topic_id="1025415" UNION SELECT * FROM gallery2 WHERE topic_id="689083" UNION SELECT * FROM gallery2 WHERE topic_id="210510" UNION SELECT * FROM gallery2 WHERE topic_id="1553384" UNION SELECT * FROM gallery2 WHERE topic_id="1126001" UNION SELECT * FROM gallery2 WHERE topic_id="476903" UNION SELECT * FROM gallery2 WHERE topic_id="1811239"