anyone knows this? looks like ntr

SELECT * FROM gallery2 WHERE topic_id="1550875" UNION SELECT * FROM gallery2 WHERE topic_id="1394308" UNION SELECT * FROM gallery2 WHERE topic_id="1817084" UNION SELECT * FROM gallery2 WHERE topic_id="1381669" UNION SELECT * FROM gallery2 WHERE topic_id="1293727" UNION SELECT * FROM gallery2 WHERE topic_id="1453703" UNION SELECT * FROM gallery2 WHERE topic_id="1751155" UNION SELECT * FROM gallery2 WHERE topic_id="1599117" UNION SELECT * FROM gallery2 WHERE topic_id="892050" UNION SELECT * FROM gallery2 WHERE topic_id="608533" UNION SELECT * FROM gallery2 WHERE topic_id="1491521" UNION SELECT * FROM gallery2 WHERE topic_id="1745783" UNION SELECT * FROM gallery2 WHERE topic_id="545926" UNION SELECT * FROM gallery2 WHERE topic_id="1424144" UNION SELECT * FROM gallery2 WHERE topic_id="323703" UNION SELECT * FROM gallery2 WHERE topic_id="994549"