CREATE TABLE "tallest_buildings" (
  "rank" real,
  "name" text,
  "height_ft_m" text,
  "floors" real,
  "year" real
);

Question: What is the highest rank of a building erected in 1976 with fewer than 21 floors?
SQL: SELECT MAX("rank") FROM "tallest_buildings" WHERE "year"=1976 AND "floors"<21;