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SELECT COUNTRY.CONTINENT, FLOOR(AVG(CITY.POPULATION)) FROM CITY JOIN COUNTRY ON CITY.COUNTRYCODE = COUNTRY.CODE WHERE CITY.NAME IS NOT NULL 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 CITY JOIN COUNTRY ON CITY.COUNTRYCODE = COUNTRY.CODE WHERE CITY.NAME IS NOT NULL GROUP BY COUNTRY.CONTINENT;