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혜온의 이것저것
[HackerRank] African Cities (MySQL) 본문
https://www.hackerrank.com/challenges/african-cities/problem?isFullScreen=true
문제
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.
Input Format
The CITY and COUNTRY tables are described as follows:
풀이
select c1.name
from city c1, country c2
where c1.countrycode = c2.code and c2.continent = 'Africa'
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