[ SQL : LENGTH ] hackerrank : Weather Observation Station 5

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.

 

>> 코드

select city, LENGTH(city)
from station
where id = (select id
    from station
    order by LENGTH(city), city
    limit 1)
or id = (
        select id
        from station
        order by LENGTH(city) desc , city
        limit 1
    )

 

사용된 개념 : LENGTH

     * LENGTH() : BYTE 수를 기준으로 문자열의 길이를 출력합니다.

     * CHAR_LENGTH() : 글자 수를 기준으로 문자열의 길이를 출력합니다.

 

 

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