What is the average number of floors for buildings in mecca ranked above 12?
CREATE TABLE "tallest_buildings_under_construction" (
  "rank" real,
  "name" text,
  "city" text,
  "height" text,
  "floors" real
);
SELECT AVG("floors") FROM "tallest_buildings_under_construction" WHERE "city"='mecca' AND "rank"<12;