[HackerRank] African Cities (MySQL)

https://www.hackerrank.com/challenges/african-cities/problem?isFullScreen=true 

African Cities | HackerRank

 

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'