What is the name of the episode with a night rank of 9?
CREATE TABLE "season_1" (
  "num" real,
  "episode" text,
  "rating" text,
  "share" real,
  "rating_share_18_49" text,
  "viewers_millions" text,
  "rank_night" text
);
SELECT "episode" FROM "season_1" WHERE "rank_night"='9';