Hacker Rank SQL

Population Density Difference Solution

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Also Visit:ย  Japan Population Solution


 

Problem

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

Input Format

Theย CITYย table is described as follows:

Field Type
ID NUMBER
NAME VARCHAR2(17)
COUNTRYCODE VARCHAR2(3)
DISTRICT VARCHAR2(20)
POPULATION NUMBER

 

Solution โ€“ Population Density Difference

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

 


Population Density and differences

The Population density is the number of people per unit of area, usually transcribed as “per square kilometer” or square mile, and which may include or exclude, for example, areas of water or glaciers. It is a key geographical term that refers to the number of people living in an area per square kilometre or other unit of land area.

Population distribution refers to the arrangement of the population on a certain area in accordance with conditions and requirements of the society. It is the spreading of people over an area of land. a measurement of population per unit land area.

I hope this helps! Let me know if you have any other questions.

 

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