Briefly state the purpose of functions in SQL environment.
SQL (Standard Query Language) is the most popular query language for relational DBMS, and most of the commercial relational database management system use SQL or a variant of SQL.
The original version of SQL was called SEQUEL. SEQUEL is a relational Query language based on neither relational algebra nor relational calculus.
It is a non- procedural language where the concept of universal quantifiers is not used.
A block structured format of English key wards is used in this query language. It is intended for interactive use by people who are not specialists in computers.
There are three types of functions that are used in SQL statements.