What network garnered 2.74 million viewers for Supernatural?
CREATE TABLE "ratings" (
  "season" real,
  "network" text,
  "timeslot" text,
  "season_premiere" text,
  "season_finale" text,
  "tv_season" text,
  "rank_rank_denotes_the_relative_position_of_the_television_series_with_respect_to_other_prime_time_shows_on_the_cw_fox_nbc_cbs_and_abc" text,
  "viewers_in_millions" text,
  "rating_rating_is_the_percentage_of_all_households_tuned_into_the_program" text
);
SELECT "network" FROM "ratings" WHERE "viewers_in_millions"='2.74';