HackerRank - Population Census

Given the CITY and COUNTRY tables, query the sum of the populations of all cities where the CONTINENT is 'Asia'.

Note: CITY.CountryCode and COUNTRY.Code are matching key columns.

 

Input Format

The CITY and COUNTRY tables are described as follows: 

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Answer

SELECT SUM(city.population)
FROM city
    INNER JOIN country ON city.countrycode = country.code
WHERE country.continent = 'Asia'

 

 

Result

27028484