Which season had less than 25.4 viewers and had a viewer rank of #6?
CREATE TABLE "ratings" (
  "season" real,
  "season_premiere" text,
  "season_finale" text,
  "tv_season" text,
  "viewer_rank_num" text,
  "households_viewers_in_millions" real
);
SELECT MIN("season") FROM "ratings" WHERE "households_viewers_in_millions"<25.4 AND "viewer_rank_num"='#6';