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Hackerrank | MySQL | Asian Population 본문
Asian Population
Asian Population | 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.
SELECT Sum(City.population)
FROM City
LEFT JOIN Country ON City.CountryCode = Country.Code
WHERE Country.Continent = 'Asia''데이터분석 > practice_query' 카테고리의 다른 글
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