What is the rating of the episode with a share of 4 and a rating/share (18-49) of 0.7/2?
CREATE TABLE "weekly_ratings" (
  "episode_number" real,
  "episode" text,
  "rating" text,
  "share" real,
  "rating_share_18_49" text,
  "viewers_millions" text,
  "rank_timeslot" real,
  "rank_night" real
);
SELECT "rating" FROM "weekly_ratings" WHERE "share"=4 AND "rating_share_18_49"='0.7/2';