What is the population (2010 census) if s barangay is 51?
CREATE TABLE "administrative_districts" (
  "district" text,
  "s_barangay" real,
  "population_2010_census" real,
  "area_has" text,
  "pop_density_per_km2" text
);
SELECT COUNT("population_2010_census") FROM "administrative_districts" WHERE "s_barangay"=51;