Population Density Difference | SQL Aggregation | HackerRank Solution

A lesson that teaches you how to solve the following problem from the SQL section in HackerRank.
https://www.hackerrank.com/challenges/population-density-difference

Learn: Building a News Blog Web App with Next.js and Express
https://www.udemy.com/course/building-a-news-blog-web-app-with-nextjs-and-express/