text: --     Author: Rodney Shaghoulian
  --     Github: github.com/rshaghoulian
  -- HackerRank: hackerrank.com/rshaghoulian
  
  SELECT SUM(CITY.POPULATION) 
  FROM CITY, COUNTRY
  WHERE CITY.COUNTRYCODE = COUNTRY.CODE AND COUNTRY.CONTINENT = 'Asia';
  