Added tasks 595, 596.

Author: javadev

src/main/java/g0501_0600/s0595_big_countries/readme.md

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+595\. Big Countries
+
+Easy
+
+SQL Schema
+
+Table: `World`
+
+ +-------------+---------+
+ | Column Name | Type |
+ +-------------+---------+
+ | name | varchar |
+ | continent | varchar |
+ | area | int |
+ | population | int |
+ | gdp | int |
+ +-------------+---------+
+ name is the primary key column 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., <code>3000000 km<sup>2</sup></code>), or
+* it has a population of at least twenty-five million (i.e., `25000000`).
+
+Write an SQL query to report the name, population, and area of the **big countries**.
+
+Return the result table in **any order**.
+
+The query 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 |
+ +-------------+------------+---------+ 

src/main/java/g0501_0600/s0595_big_countries/script.sql

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+# Write your MySQL query statement below
+# #Easy #Database
+select name, population, area
+from world
+where area >= 3000000
+or population >= 25000000

src/main/java/g0501_0600/s0596_classes_more_than_5_students/readme.md

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+596\. Classes More Than 5 Students
+
+Easy
+
+SQL Schema
+
+Table: `Courses`
+
+ +-------------+---------+
+ | Column Name | Type |
+ +-------------+---------+
+ | student | varchar |
+ | class | varchar |
+ +-------------+---------+
+ (student, class) is the primary key column for this table.
+ Each row of this table indicates the name of a student and the class in which they are enrolled. 
+
+Write an SQL query to report all the classes that have **at least five students**.
+
+Return the result table in **any order**.
+
+The query result format is in the following example.
+
+**Example 1:**
+
+**Input:**
+
+ Courses table:
+ +---------+----------+
+ | student | class |
+ +---------+----------+
+ | A | Math |
+ | B | English |
+ | C | Math |
+ | D | Biology |
+ | E | Math |
+ | F | Computer |
+ | G | Math |
+ | H | Math |
+ | I | Math |
+ +---------+----------+
+
+**Output:**
+
+ +---------+
+ | class |
+ +---------+
+ | Math |
+ +---------+
+
+**Explanation:**
+
+ - Math has 6 students, so we include it.
+ - English has 1 student, so we do not include it.
+ - Biology has 1 student, so we do not include it.
+ - Computer has 1 student, so we do not include it. 

src/main/java/g0501_0600/s0596_classes_more_than_5_students/script.sql

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+# Write your MySQL query statement below
+# #Easy #Database
+select class
+from Courses
+group by class
+having count(student) >= 5