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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 – Revising Aggregations – Averages – Hacker Rank Solution
Revising Aggregations – Averages – Hacker Rank Solution
Problem:
Query the average population of all cities in CITY where District is California.
Input Format
The CITY table is described as follows:

Revising Aggregations – Averages – Hacker Rank Solution
select avg(POPULATION) from CITY WHERE DISTRICT = 'California';
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