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https://www.hackerrank.com/challenges/asian-population/problem?isFullScreen=true Population Census | HackerRank Query the sum of the populations of all cities on the continent 'Asia'. www.hackerrank.com 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. 해석: 주어진 CITY와 CO..

https://www.hackerrank.com/challenges/african-cities/problem?isFullScreen=true African Cities | HackerRank Query the names of all cities on the continent 'Africa'. www.hackerrank.com Given the CITY and COUNTRY tables, query the names of all cities where the CONTINENT is 'Africa'. Note: CITY.CountryCode and COUNTRY.Code are matching key columns. 해석: 주어진 CITY와 COUNTRY 테이블에서 COUNTINENT가 Africa인 모든 ..