595. Big Countries.sql

-- Problem
-- +-------------+---------+
-- | Column Name | Type    |
-- +-------------+---------+
-- | name        | varchar |
-- | continent   | varchar |
-- | area        | int     |
-- | population  | int     |
-- | gdp         | bigint  |
-- +-------------+---------+
-- name is the primary key (column with unique values) for this table.
-- Each row of this table gives information about the name of a country, the continent to which it belongs, its area, the population, and its GDP value.

 

-- 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.

-- Return the result table in any order.

-- The result format is in the following example.

 

-- Example 1:

-- Input: 
-- World table:
-- +-------------+-----------+---------+------------+--------------+
-- | name        | continent | area    | population | gdp          |
-- +-------------+-----------+---------+------------+--------------+
-- | Afghanistan | Asia      | 652230  | 25500100   | 20343000000  |
-- | Albania     | Europe    | 28748   | 2831741    | 12960000000  |
-- | Algeria     | Africa    | 2381741 | 37100000   | 188681000000 |
-- | Andorra     | Europe    | 468     | 78115      | 3712000000   |
-- | Angola      | Africa    | 1246700 | 20609294   | 100990000000 |
-- +-------------+-----------+---------+------------+--------------+
-- Output: 
-- +-------------+------------+---------+
-- | name        | population | area    |
-- +-------------+------------+---------+
-- | Afghanistan | 25500100   | 652230  |
-- | Algeria     | 37100000   | 2381741 |
-- +-------------+------------+---------+


-- Solution
select name, population, area
from World
where area >= 3000000
or population >= 25000000;