Left or right

SELECT * FROM gallery2 WHERE topic_id="1615743" UNION SELECT * FROM gallery2 WHERE topic_id="308147" UNION SELECT * FROM gallery2 WHERE topic_id="1515773" UNION SELECT * FROM gallery2 WHERE topic_id="809702" UNION SELECT * FROM gallery2 WHERE topic_id="121477" UNION SELECT * FROM gallery2 WHERE topic_id="1587936" UNION SELECT * FROM gallery2 WHERE topic_id="1658555" UNION SELECT * FROM gallery2 WHERE topic_id="858644" UNION SELECT * FROM gallery2 WHERE topic_id="310725" UNION SELECT * FROM gallery2 WHERE topic_id="913281" UNION SELECT * FROM gallery2 WHERE topic_id="238640" UNION SELECT * FROM gallery2 WHERE topic_id="842633" UNION SELECT * FROM gallery2 WHERE topic_id="866726" UNION SELECT * FROM gallery2 WHERE topic_id="1522443" UNION SELECT * FROM gallery2 WHERE topic_id="1036803" UNION SELECT * FROM gallery2 WHERE topic_id="1568389"