Waterfall

SELECT * FROM gallery2 WHERE topic_id="688913" UNION SELECT * FROM gallery2 WHERE topic_id="863086" UNION SELECT * FROM gallery2 WHERE topic_id="849387" UNION SELECT * FROM gallery2 WHERE topic_id="1433574" UNION SELECT * FROM gallery2 WHERE topic_id="1330302" UNION SELECT * FROM gallery2 WHERE topic_id="1538963" UNION SELECT * FROM gallery2 WHERE topic_id="1580556" UNION SELECT * FROM gallery2 WHERE topic_id="1534973" UNION SELECT * FROM gallery2 WHERE topic_id="83951" UNION SELECT * FROM gallery2 WHERE topic_id="913334" UNION SELECT * FROM gallery2 WHERE topic_id="1501113" UNION SELECT * FROM gallery2 WHERE topic_id="1750746" UNION SELECT * FROM gallery2 WHERE topic_id="754997" UNION SELECT * FROM gallery2 WHERE topic_id="1469296" UNION SELECT * FROM gallery2 WHERE topic_id="911701" UNION SELECT * FROM gallery2 WHERE topic_id="1243175"