What is the smallest timeslot rank when the rating is smaller than 2.6?
CREATE TABLE "the_biggest_loser_u_s_tv_series" (
  "episode" real,
  "rating" real,
  "share" real,
  "rating_share_18_49" text,
  "rank_timeslot" real,
  "rank_night" real
);
SELECT MIN("rank_timeslot") FROM "the_biggest_loser_u_s_tv_series" WHERE "rating"<2.6;