What is the total area for a code less than 1862 and a density (per km 2 land) of 21.6?
CREATE TABLE "references" (
  "code" real,
  "municipality" text,
  "county" text,
  "population" real,
  "total_area" text,
  "density_per_km_2_land" real
);
SELECT "total_area" FROM "references" WHERE "code"<1862 AND "density_per_km_2_land"=21.6;