[MySQL/HackerRank] Weather Observation Station 5

Question

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 3, 3, 4 and 3. The longest name is PQRS, but there are 3 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.

 

My Answer

select city, char_length(city) as len_city
from station
order by len_city, city
limit 1;

select city, char_length(city) as len_city
from station
order by len_city desc, city
limit 1;

Result

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

Weather Observation Station 5 | HackerRank