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Select COUNTRY.Continent, FLOOR(AVG(CITY.POPULATION)) from COUNTRY INNER JOIN CITY ON COUNTRY.Code = CITY.CountryCode GROUP BY COUNTRY.Continent;
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Average Population of Each Continent
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Select COUNTRY.Continent, FLOOR(AVG(CITY.POPULATION)) from COUNTRY INNER JOIN CITY ON COUNTRY.Code = CITY.CountryCode GROUP BY COUNTRY.Continent;