Average Population | SQL – HackerRank

Given the CITY and COUNTRY tables, query the names of all the continents (COUNTRY.Continent) and their respective average city populations (CITY.Population) rounded down to the nearest integer.
Note: CITY.CountryCode and COUNTRY.Code are matching key columns. Do not include continents without cities in your output.
Input Format
The CITY and COUNTRY tables are described as follows:

select country.continent, floor(AVG(city.population))from country INNER JOIN city ON city.countrycode=country.code group by country.continent

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