Who was the winner in 2013?
CREATE TABLE "tour_de_france_stages_with_summit_finish" (
  "year" real,
  "stage" real,
  "start_of_stage" text,
  "distance_km" text,
  "category" text,
  "stage_winner" text,
  "yellow_jersey" text
);
SELECT "stage_winner" FROM "tour_de_france_stages_with_summit_finish" WHERE "year"=2013;