[해커랭크] Population Density Difference

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

 

❓문제

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

Input Format

The CITY table is described as follows: 

 

🔉 문제 설명

인구수의 최대와 최소의 차를 쿼

 

❗답

SELECT MAX(POPULATION) - MIN(POPULATION)
FROM CITY

 

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