Which air date has 5 for # in season?
CREATE TABLE "season_4_2001_2002" (
  "episode_num" real,
  "num_in_season" real,
  "episode_name" text,
  "airdate" text,
  "location" text
);
SELECT "airdate" FROM "season_4_2001_2002" WHERE "num_in_season"=5;