[HackerRank/SQL] Basic Select - Weather Observation Station 11 (feat. REGEXP)

Problem. Basic Select - Weather Observation Station 11

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Link.

https://www.hackerrank.com/challenges/weather-observation-station-11/problem?utm_campaign=challenge-recommendation&utm_medium=email&utm_source=24-hour-campaign&h_r=next-challenge&h_v=zen&h_r=next-challenge&h_v=zen&h_r=next-challenge&h_v=zen 

Weather Observation Station 11 | HackerRank

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Description.

Query the list of CITY names from STATION that either do not start with vowels or do not end with vowels. Your result cannot contain duplicates.

 

STATION 테이블에서 도시 이름이 a, e, i, o, u로 시작하지도 끝나지도 않는 도시들을 반환하는 SQL문을 작성하시오.

단, 도시 이름이 중복되지 않아야 합니다.

STATION 테이블

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Key Point. 

REGXP, 정규표현식(Regular Expression)을 사용하면 복잡한 문자열 조건을 걸어 데이터를 검색할 수 있다.

• | : OR

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My Answer. 

SELECT DISTINCT CITY 
FROM STATION
WHERE CITY REGEXP '^[^aeiou].*|[^aeiou]$';

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References. 

MySQL 정규표현식: https://velog.io/@gillog/MySQL-REGEXPRegular-Expression%EC%A0%95%EA%B7%9C-%ED%91%9C%ED%98%84%EC%8B%9D

[MySQL] REGEXP(Regular Expression(정규 표현식))