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select COUNTRY.Continent, FLOOR(avg(CITY.Population))
from CITY
INNER JOIN
COUNTRY ON CITY.CountryCode = COUNTRY.Code
GROUP BY COUNTRY.Continent
ORDER BY COUNTRY.Continent
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Average Population of Each Continent
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select COUNTRY.Continent, FLOOR(avg(CITY.Population)) from CITY INNER JOIN COUNTRY ON CITY.CountryCode = COUNTRY.Code GROUP BY COUNTRY.Continent ORDER BY COUNTRY.Continent