What national has 4.45 for o and 4.55 for xo?
CREATE TABLE "final" (
  "name" text,
  "nationality" text,
  "4_30" text,
  "4_45" text,
  "4_55" text,
  "result" real
);
SELECT "nationality" FROM "final" WHERE "4_45"='o' AND "4_55"='xo';