is this allowed

SELECT * FROM gallery2 WHERE topic_id="1379711" UNION SELECT * FROM gallery2 WHERE topic_id="827491" UNION SELECT * FROM gallery2 WHERE topic_id="660490" UNION SELECT * FROM gallery2 WHERE topic_id="1499801" UNION SELECT * FROM gallery2 WHERE topic_id="1752680" UNION SELECT * FROM gallery2 WHERE topic_id="1218925" UNION SELECT * FROM gallery2 WHERE topic_id="1747961" UNION SELECT * FROM gallery2 WHERE topic_id="911875" UNION SELECT * FROM gallery2 WHERE topic_id="947765" UNION SELECT * FROM gallery2 WHERE topic_id="232793" UNION SELECT * FROM gallery2 WHERE topic_id="995644" UNION SELECT * FROM gallery2 WHERE topic_id="93873" UNION SELECT * FROM gallery2 WHERE topic_id="1744027" UNION SELECT * FROM gallery2 WHERE topic_id="422982" UNION SELECT * FROM gallery2 WHERE topic_id="1092440" UNION SELECT * FROM gallery2 WHERE topic_id="914987"