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MYSql
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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MYSql
SELECT COUNTRY.CONTINENT, FLOOR(AVG(CITY.POPULATION)) FROM COUNTRY INNER JOIN CITY ON COUNTRY.CODE = CITY.COUNTRYCODE GROUP BY COUNTRY.CONTINENT;