What rank by average has 1 dance on season 9?
CREATE TABLE "average_scores_of_all_couples" (
  "rank_by_average" text,
  "place" text,
  "perfect_40s" text,
  "total" text,
  "number_of_dances" text,
  "season" text,
  "average" text
);
SELECT "rank_by_average" FROM "average_scores_of_all_couples" WHERE "number_of_dances"='1' AND "season"='9';