what is the score when the venue is athens olympic stadium on 30 april 2011?
CREATE TABLE "greek_cup_finals" (
  "year" text,
  "winner" text,
  "runner_up" text,
  "score" text,
  "venue" text
);
SELECT "score" FROM "greek_cup_finals" WHERE "venue"='athens olympic stadium' AND "year"='30 april 2011';