[MySQL] HackerRank - Weather Observation Station 5

 

문제

https://www.hackerrank.com/challenges/weather-observation-station-5/problem

Weather Observation Station 5 | HackerRank

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

Explanation:

When ordered alphabetically, the CITY names are listed as ABC, DEF, PQRS, and WXY, with lengths 3, 3, 4 and 3. 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.

해석) CITY에서 가장 짧은 이름을 가진 도시와, 가장 긴 이름을 가진 도시를 출력하라. 

 

정답

아니 쿼리 두개로 입력하라그래서 두개로만 입력했더니 계속 오류뜨길래 인터넷 찾아보니까 UNION 으로 묶은것을 볼 수있었다. 아니 쿼리 두개로 하라면서 ㅠ  UNION으로 묶으면 이게 한개지 두개냐!!! 어쨋든 통과...

(
    SELECT CITY, LENGTH(CITY)
    FROM STATION
    ORDER BY LENGTH(CITY) ASC, CITY ASC
    LIMIT 1
)

UNION

(
    SELECT CITY, LENGTH(CITY)
    FROM STATION
    ORDER BY LENGTH(CITY) DESC, CITY ASC
    LIMIT 1
)