HackerRank: [SQL Aggregation] (6/17) POPULATION DENSITY DIFFERENCE | max, min function in SQL

I started studying SQL from a very famous site - HackerRank. Here I will try to provide multiple approaches & solutions to the same problem. It will help you learn and understand SQL in a better way.

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Recommended SQL Courses:

1. Udemy: SQL - MySQL for Data Analytics and Business Intelligence
2. LinkedIn: Master SQL for Data Science
3. edX: Databases: Advanced Topics in SQL
4. edureka: SQL Essentials Training & Certification
5. Coursera: Learn SQL Basics for Data Science
6. Eduonix: SQL Queries

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SQL Problem Statement:

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

Input Format:

The CITY table is described as follows:

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Solution: Using MAX & MIN Function (MySQL Query):

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

NOTE: 

1. MAX function used to get the largest value of all the records in the specified column name passed to the function.
2. MIN function used to get the least (smallest) value of all the records in the specified column name passed to the function.

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Sample Output:

4695354

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-Akshay P Daga