SQL is a structured query language that is used to communicate with database where **database **is the organized collection of data that is usually stored electronically on your computer.

There various types of database management system including

• Hierarchical databases.
• Network databases.
• Relational databases.
• Object-oriented databases.
• Graph databases.
• ER model databases.
• Document databases.
• NoSQL databases.

On this Tutorial will focus on relational database management systems of which SQL is it’s standard language .

Some common relational database management systems that use SQL are: Oracle, Sybase, Microsoft SQL Server, Access, Ingres, etc.

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