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Population Census 
Population Census
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SELECT sum(c.population) from city c inner JOIN country ct on c.countrycode=ct.code where continent ='ASIA';
SELECT SUM(CITY.Population) FROM CITY JOIN COUNTRY ON CITY.CountryCode = COUNTRY.Code WHERE Continent = 'Asia';
SELECT SUM(CITY.POPULATION) FROM COUNTRY JOIN CITY ON CITY.COUNTRYCODE = COUNTRY.CODE WHERE COUNTRY.CONTINENT = 'Asia';
SELECT SUM(CITY.POPULATION) FROM CITY INNER JOIN COUNTRY ON CITY.COUNTRYCODE = COUNTRY.CODE WHERE COUNTRY.CONTINENT = "Asia";
MYSql
SELECT SUM(CITY.POPULATION) FROM CITY INNER JOIN COUNTRY ON CITY.COUNTRYCODE = COUNTRY.CODE WHERE COUNTRY.CONTINENT = 'Asia';