CREATE TABLE table_204_654 (id DECIMAL, "year" DECIMAL, "song" TEXT, "u.s." DECIMAL, "u.s.\ r&b" DECIMAL, "u.s.\ ac" DECIMAL, "uk" DECIMAL, "album" TEXT)

what song hit the highest spot on the uk chart ?
SELECT "song" FROM table_204_654 ORDER BY "uk" LIMIT 1
SELECT "song" FROM "table_204_654" ORDER BY "uk" NULLS FIRST LIMIT 1