[SQL문제풀기] Population Density Difference

문제

Population Density Difference | HackerRank

Query the difference between the maximum and minimum city populations in CITY.

https://www.hackerrank.com/challenges/population-density-difference/problem?isFullScreen=true

MySQL, Oracle, MS SQL Server, DB2

내가 작성한 정답

select max(population)-min(population)
from city;