Tree

SELECT * FROM gallery2 WHERE topic_id="1672099" UNION SELECT * FROM gallery2 WHERE topic_id="786014" UNION SELECT * FROM gallery2 WHERE topic_id="495286" UNION SELECT * FROM gallery2 WHERE topic_id="1626211" UNION SELECT * FROM gallery2 WHERE topic_id="1357031" UNION SELECT * FROM gallery2 WHERE topic_id="1615651" UNION SELECT * FROM gallery2 WHERE topic_id="1259735" UNION SELECT * FROM gallery2 WHERE topic_id="1420519" UNION SELECT * FROM gallery2 WHERE topic_id="1758791" UNION SELECT * FROM gallery2 WHERE topic_id="1237926" UNION SELECT * FROM gallery2 WHERE topic_id="984007" UNION SELECT * FROM gallery2 WHERE topic_id="629493" UNION SELECT * FROM gallery2 WHERE topic_id="1323999" UNION SELECT * FROM gallery2 WHERE topic_id="1499347" UNION SELECT * FROM gallery2 WHERE topic_id="895092" UNION SELECT * FROM gallery2 WHERE topic_id="828108"