What is the lowest Population (1 July 2005 est.), when Population density (per km²) is 0?
CREATE TABLE "sovereign_states" (
  "name" text,
  "subdivisions" text,
  "area_km" real,
  "population_1_july_2005_est" real,
  "population_density_per_km" real,
  "capital" text
);
SELECT MIN("population_1_july_2005_est") FROM "sovereign_states" WHERE "population_density_per_km"=0;