Puzzled

SELECT * FROM gallery2 WHERE topic_id="1246650" UNION SELECT * FROM gallery2 WHERE topic_id="878486" UNION SELECT * FROM gallery2 WHERE topic_id="1224180" UNION SELECT * FROM gallery2 WHERE topic_id="691227" UNION SELECT * FROM gallery2 WHERE topic_id="248673" UNION SELECT * FROM gallery2 WHERE topic_id="1689322" UNION SELECT * FROM gallery2 WHERE topic_id="1409383" UNION SELECT * FROM gallery2 WHERE topic_id="1484015" UNION SELECT * FROM gallery2 WHERE topic_id="654008" UNION SELECT * FROM gallery2 WHERE topic_id="1682649" UNION SELECT * FROM gallery2 WHERE topic_id="1071488" UNION SELECT * FROM gallery2 WHERE topic_id="492245" UNION SELECT * FROM gallery2 WHERE topic_id="1354921" UNION SELECT * FROM gallery2 WHERE topic_id="593228" UNION SELECT * FROM gallery2 WHERE topic_id="1555467" UNION SELECT * FROM gallery2 WHERE topic_id="1763477"