[SQL][HackerRank]African Cities

https://www.hackerrank.com/challenges/african-cities/problem?h_r=next-challenge&h_v=zen

African Cities | HackerRank

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:

• join two tables ==> FROM CITY AS i JOIN COUNTRY AS o ON i.COUNTRYCODE=o.CODE
• query names of all cities ==> SELECT i.NAME
• where the Continent is ‘Africa’ ==> WHERE o.CONTINENT=‘Africa’

SELECT I.NAME 
FROM CITY AS I 
JOIN COUNTRY AS O ON I.COUNTRYCODE = O.CODE
WHERE O.CONTINENT = 'Africa';