Have we met before?

SELECT * FROM gallery2 WHERE topic_id="1388012" UNION SELECT * FROM gallery2 WHERE topic_id="790752" UNION SELECT * FROM gallery2 WHERE topic_id="1752031" UNION SELECT * FROM gallery2 WHERE topic_id="351347" UNION SELECT * FROM gallery2 WHERE topic_id="572747" UNION SELECT * FROM gallery2 WHERE topic_id="247349" UNION SELECT * FROM gallery2 WHERE topic_id="1775706" UNION SELECT * FROM gallery2 WHERE topic_id="533122" UNION SELECT * FROM gallery2 WHERE topic_id="1313526" UNION SELECT * FROM gallery2 WHERE topic_id="423219" UNION SELECT * FROM gallery2 WHERE topic_id="1359078" UNION SELECT * FROM gallery2 WHERE topic_id="557384" UNION SELECT * FROM gallery2 WHERE topic_id="1004603" UNION SELECT * FROM gallery2 WHERE topic_id="1048504" UNION SELECT * FROM gallery2 WHERE topic_id="775245" UNION SELECT * FROM gallery2 WHERE topic_id="1515720"