What is the weekly rank for the episode with a share over 7 and a rating/share of 2.3/7?
CREATE TABLE "u_s_nielsen_ratings" (
  "episode" text,
  "rating" real,
  "share" real,
  "rating_share_18_49" text,
  "viewers_millions" real,
  "rank_timeslot" text,
  "rank_night" text,
  "rank_week" text
);
SELECT "rank_week" FROM "u_s_nielsen_ratings" WHERE "share">7 AND "rating_share_18_49"='2.3/7';