Why SQL

SQL serves as a standard language that:

Can be used either for ad hoc queries and updates or in application programs.
Eliminates the need for the user to know how the database is physically structured.
Facilitates the exchange of information from computer to computer and from database to database.

Benefits of a Standard Language

You need less training when you move from one computer or product to another.
One database management system can communicate with another if they use a standard interface.