How many production codes were there for the episode that aired on November 15?
CREATE TABLE "november" (
  "episode_num" real,
  "the_w_rd" text,
  "guest" text,
  "introductory_phrase" text,
  "original_airdate" text,
  "production_code" real
);
SELECT COUNT("production_code") FROM "november" WHERE "original_airdate"='November 15';