What was the first airdate or the season that had less than 24 episodes and a Nielsen ranking of #38?
CREATE TABLE "ratings" (
  "season" text,
  "episodes" real,
  "first_airdate" text,
  "last_airdate" text,
  "nielsen_ranking" text
);
SELECT "first_airdate" FROM "ratings" WHERE "episodes"<24 AND "nielsen_ranking"='#38';