What is the smallest rating with nightly rank smaller than 7, timeslot rank smaller than 5 and eposide after episode 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("rating") FROM "the_biggest_loser_u_s_tv_series" WHERE "rank_night"<7 AND "rank_timeslot"<5 AND "episode">6;