CREATE TABLE "table1_19236587_4" (
  "series_no" real,
  "season_no" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "u_k_viewers_million" text
);

Question: When did the episode titled "The Fashion Show" air for the first time?
SQL: SELECT "original_air_date" FROM "table1_19236587_4" WHERE "title"='\"The Fashion Show\"';

Question: What's the series number of the episode with season number 2?
SQL: SELECT MIN("series_no") FROM "table1_19236587_4" WHERE "season_no"=2;

Question: What's the series number of the episode seen by 2.43 million viewers in the UK?
SQL: SELECT "series_no" FROM "table1_19236587_4" WHERE "u_k_viewers_million"='2.43';

Question: How many different original air dates does the episode with series number 13 have?
SQL: SELECT COUNT("original_air_date") FROM "table1_19236587_4" WHERE "series_no"=13;