HackerRank MySQL - Average Population of Each Continent
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.
- SELECT COUNTRY.CONTINENT, FLOOR(AVG(CITY.POPULATION))
- FROM CITY
- JOIN COUNTRY ON CITY.COUNTRYCODE = COUNTRY.CODE
- GROUP BY COUNTRY.CONTINENT;