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SELECT COUNTRY.CONTINENT, FLOOR(AVG(CITY.POPULATION)) AS AVG_POP
FROM COUNTRY
JOIN CITY ON CITY.COUNTRYCODE = COUNTRY.CODE
GROUP BY COUNTRY.CONTINENT
ORDER BY AVG_POP ASC;
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Average Population of Each Continent
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This one is easier:
SELECT COUNTRY.CONTINENT, FLOOR(AVG(CITY.POPULATION)) AS AVG_POP FROM COUNTRY JOIN CITY ON CITY.COUNTRYCODE = COUNTRY.CODE GROUP BY COUNTRY.CONTINENT ORDER BY AVG_POP ASC;