refactor 595

Author: fishercoder1534

database/_595.sql

@@ -1 +1,26 @@
+--595. Big Countries
+--There is a table World
+--
+--+-----------------+------------+------------+--------------+---------------+
+--| name            | continent  | area       | population   | gdp           |
+--+-----------------+------------+------------+--------------+---------------+
+--| Afghanistan     | Asia       | 652230     | 25500100     | 20343000      |
+--| Albania         | Europe     | 28748      | 2831741      | 12960000      |
+--| Algeria         | Africa     | 2381741    | 37100000     | 188681000     |
+--| Andorra         | Europe     | 468        | 78115        | 3712000       |
+--| Angola          | Africa     | 1246700    | 20609294     | 100990000     |
+--+-----------------+------------+------------+--------------+---------------+
+--A country is big if it has an area of bigger than 3 million square km or a population of more than 25 million.
+--
+--Write a SQL solution to output big countries' name, population and area.
+--
+--For example, according to the above table, we should output:
+--
+--+--------------+-------------+--------------+
+--| name         | population  | area         |
+--+--------------+-------------+--------------+
+--| Afghanistan  | 25500100    | 652230       |
+--| Algeria      | 37100000    | 2381741      |
+--+--------------+-------------+--------------+
+
 select name, population, area from World where area > 3000000 or population > 25000000;