[Oracle] HackerLank-Weather Observation Station 5 문제

Query the two cities in STATION with the shortest and longest CITY names, as well as their respective lengths (i.e.: number of characters in the name). If there is more than one smallest or largest city, choose the one that comes first when ordered alphabetically.
The STATION table is described as follows:

where LAT_N is the northern latitude and LONG_W is the western longitude.

Sample Input

For example, CITY has four entries: DEF, ABC, PQRS and WXY.

Sample Output

ABC 3
PQRS 4

Explanation

When ordered alphabetically, the CITY names are listed as ABC, DEF, PQRS, and WXY, with lengths  and . The longest name is PQRS, but there are  options for shortest named city. Choose ABC, because it comes first alphabetically.

Note
You can write two separate queries to get the desired output. It need not be a single query.

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Station 테이블 안의 내용 중 CITY 단어가 제일 짧은 것 한개 (이름 오름차순), 단어가 제일 긴 것 한개를 선정해서 보여주는 것

이때, UNION FUNCTION이 핵심

SELECT *
FROM
    (SELECT CITY, LENGTH(CITY)
    FROM STATION
    ORDER BY LENGTH(CITY), CITY)
WHERE ROWNUM = 1
UNION
SELECT *
FROM
    (SELECT CITY, LENGTH(CITY)
    FROM STATION
    ORDER BY LENGTH(CITY) DESC, CITY)
WHERE ROWNUM = 1
;