CREATE TABLE table_6664 ("Season" CLOB, "Competition" CLOB, "Round" CLOB, "Club" CLOB, "Score" CLOB)

What is the final score of the 1st round game of club Union Luxembourg?
SELECT "Score" FROM table_6664 WHERE "Round" = '1st round' AND "Club" = 'union luxembourg'
SELECT "Score" FROM "table_6664" WHERE "Club" = 'union luxembourg' AND "Round" = '1st round'