SQL is a database computer language designed for the retrieval and management of data in a relational database. SQL stands for Structured Query Language.
SQL is the standard language for Relational Database System. All the Relational Database Management Systems (RDMS) like MySQL, MS Access, Oracle, Sybase, Informix, Postgres and SQL Server use SQL as their standard database language.
Allows users to access data in the relational database management systems.
Allows users to describe the data.
Allows users to define the data in a database and manipulate that data.
Allows to embed within other languages using SQL modules, libraries & pre-compilers.
Allows users to create and drop databases and tables.
Allows users to create view, stored procedure, functions in a database.
Allows users to set permissions on tables, procedures and views.
The databases in early systems were stored on tapes, which were read only format, which means once you store data. It is impossible to delete or update or even add any new data on it easily.
Which is why the father of database system, Founder of Oracle, Larry Ellison found the need to a fully managed database system and launched oracle in the market.
SQL queryies are instructions. It is used to communicate with the database. It is also used to perform specific tasks, functions, and queries of data.
SQL can perform various tasks like create a table, add data to tables, drop the table, modify the table, set permission for users.