Which Competition has a Result of w, and a Score of 2-0, and a Date of may 9, 1954?
CREATE TABLE "brazil_national_team" (
  "date" text,
  "result" text,
  "score" text,
  "brazil_scorers" text,
  "competition" text
);
SELECT "competition" FROM "brazil_national_team" WHERE "result"='w' AND "score"='2-0' AND "date"='may 9, 1954';