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SELECT country.continent, floor(avg(city.population))
from country join city
on city.countrycode = country.code group by country.continent
having avg(city.population) is not null
order by avg(city.population);
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Average Population of Each Continent
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SELECT country.continent, floor(avg(city.population)) from country join city on city.countrycode = country.code group by country.continent having avg(city.population) is not null order by avg(city.population);