Can you tell me the sun of Population that has the Country/Region of hong kong, and the Rank smaller than 2?
CREATE TABLE "with_population_above_1_million" (
  "rank" real,
  "country_region" text,
  "population" real,
  "area_km_2" real,
  "density_pop_per_km_2" real
);
SELECT SUM("population") FROM "with_population_above_1_million" WHERE "country_region"='hong kong' AND "rank"<2;