CREATE TABLE "sovereign_states" (
  "name" text,
  "subdivisions" text,
  "area_km" real,
  "population_1_july_2005_est" real,
  "population_density_per_km" real,
  "capital" text
);

Question: What is the sum of Population (1 July 2005 est.), when Area (km²) is less than 5,131, when Population density (per km²) is less than 180, when Subdivisions is Parishes, and when Capital is Roseau?
SQL: SELECT SUM("population_1_july_2005_est") FROM "sovereign_states" WHERE "area_km"<'5,131' AND "population_density_per_km"<180 AND "subdivisions"='parishes' AND "capital"='roseau';

Question: What is the lowest Population (1 July 2005 est.), when Population density (per km²) is 0?
SQL: SELECT MIN("population_1_july_2005_est") FROM "sovereign_states" WHERE "population_density_per_km"=0;

Question: What is Population density (per km²), when Name is Antigua and Barbuda, and when Capital is St. John's?
SQL: SELECT "population_density_per_km" FROM "sovereign_states" WHERE "name"='antigua and barbuda' AND "capital"='st. john''s';