What is Surface, when Edition is 2012, and when Outcome is Winner?
CREATE TABLE "singles_7_4_3" (
  "outcome" text,
  "edition" real,
  "round" text,
  "opponent_team" text,
  "surface" text,
  "opponent" text,
  "score" text
);
SELECT "surface" FROM "singles_7_4_3" WHERE "edition"=2012 AND "outcome"='winner';