> For the complete documentation index, see [llms.txt](https://mun.gitbook.io/dbms/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mun.gitbook.io/dbms/database/introduction-to-database/query-language.md).

# Query Language

## Query Language

Query language is used to define, manipulate and retrieve data from database.

Data Definition Language: Operation related to database and table create, drop, and update

Data Manipulation Language: Operation related to table to insert, delete and update data

Data Query Language: Operation related to retrieve data from a database

## Different Query Language

* QUEL (QUEry Languages)
* QBE (Query By Example)
* SEQUL (Structured English QUery Language)
* SQL (Structured Query Language)

## Different SQL Platform

* Microsoft SQL Server
* MySQL
* Oracle SQL

## MySQL

* MySQL is a free and open-source relational database management system (RDBMS) based on Structured Query Language (SQL)
* Michael Monty Widenius and David Axmark began writing the first version of the MySQL database in 1995 and released in 1996. "My" is the name of Michael Widenius's daughter and "SQL" is the abbreviation for Structured Query Language.