11 - Weather Observation Station 6.sql

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--       Information
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-- Direct Link: https://www.hackerrank.com/challenges/weather-observation-station-6/problem
-- Difficulty: Easy
-- Max Score: 10
-- DBMS: mySQL

-- ========================
--         Solution
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SELECT DISTINCT(CITY)
FROM STATION 
WHERE SUBSTR(CITY, 1, 1) IN ('A', 'E', 'I', 'O', 'U');

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--       Explanation
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-- DISTINCT() used to avoid duplication
-- SUBSTR() used to extract a substring from the text in a column (start at position 1, extract 1 character)