18. Big Countries
https://leetcode.com/problems/big-countries/
#문제 : A country is big if: it has an area of at least three million (i.e., 3000000 km2), or it has a population of at least twenty-five million (i.e., 25000000). Write a solution to find the name, population, and area of the big countries.
select name, population, area from world where area >= 3000000 or population >= 25000000