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Editor to share with you what the function of sql language, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to understand it!

The functions of sql language

SQL has the functions of data definition, data manipulation and data control.

1. SQL data definition function

Can define the three-level schema structure of the database, namely, external schema, global schema and internal schema structure. In SQL, the outer schema is called View, and the global schema is called Schema. The inner schema is automatically implemented by the system according to the database schema, and generally does not need to be asked by the user.

2. SQL data manipulation function

It includes data insertion, deletion and modification of basic tables and views, especially with strong data query function.

3. Data control function of SQL.

The main purpose is to control the access rights of users in order to ensure the security of the system.

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