How man seasons have the air date of October 2, 2001? 
CREATE TABLE "episode_list" (
  "series_num" real,
  "season_num" real,
  "title" text,
  "director" text,
  "writer_s" text,
  "nbc_airdate" text,
  "code" real
);
SELECT COUNT("season_num") FROM "episode_list" WHERE "nbc_airdate"='October 2, 2001';