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Hackerrank | MySQL | Asian Population 본문
Asian Population
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'
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