Average Population of Each Continent in SQL | HackerRank Programming Solutions | HackerRank SQL Solutions

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SQL Programming Solutions | Hackerrank Solutions | DBMS | MYSql

Hello Programmers/Coders, Today we are going to share solutions of Programming problems of HackerRank of Programming Language SQL. At Each Problem with Successful submission with all Test Cases Passed, you will get an score or marks. And after solving maximum problems, you will be getting stars. This will highlight your profile to the recruiters.

In this post, you will find the solution for Average Population of Each Continent in SQL-HackerRank Problem. We are providing the correct and tested solutions of coding problems present on HackerRank. If you are not able to solve any problem, then you can take help from our Blog/website.

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Introduction To SQL

SQL stands for Structured Query Language. SQL is used to create, remove, alter the database and database objects in a database management system and to store, retrieve, update the data in a database. SQL is a standard language for creating, accessing, manipulating database management system. SQL works for all modern relational database management systems, like SQL Server, Oracle, MySQL, etc.

  • It is a standard language for Relational Database System. It enables a user to create, read, update and delete relational databases and tables.
  • All the RDBMS like MySQL, Informix, Oracle, MS Access and SQL Server use SQL as their standard database language.
  • SQL allows users to query the database in a number of ways, using English-like statements.

Link for the Problem – Average Population of Each Continent – Hacker Rank Solution

Average Population of Each Continent – Hacker Rank Solution

Problem:

Given the CITY and COUNTRY tables, query the names of all the continents (COUNTRY.Continent) and their respective average city populations (CITY.Population) rounded down to the nearest integer.

Note: CITY.CountryCode and COUNTRY.Code are matching key columns.

Input Format

The CITY and COUNTRY tables are described as follows:

Average Population of Each Continent
Average Population of Each Continent
Average Population of Each Continent – Hacker Rank Solution
SELECT o.CONTINENT, FLOOR(AVG(i.POPULATION)) 
FROM CITY AS i JOIN COUNTRY AS o ON i.COUNTRYCODE=o.CODE GROUP BY o.CONTINENT;

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