[HackerRank SQL] Weather Observation Station 6

문제 link
https://www.hackerrank.com/challenges/weather-observation-station-6/problem

Code link
https://github.com/JamesJung01/Hackerrank_sql/blob/main/01_Easy/Weather_Observation_Stations6.sql

SELECT DISTINCT CITY
FROM STATION
WHERE LOWER(SUBSTR(CITY, 1, 1)) IN ('a', 'e', 'i', 'o', 'u');