Although SQL is an ANSI (American National Standards Institute) standard, there are many different versions of the SQL language. However, to be compliant with the ANSI standard, they all support at least the major commands (such as SELECT, UPDATE, DELETE, INSERT, WHERE) in a similar manner.

Introduction to SQL (Structured Query Language) provides a foundation for managing and manipulating relational databases. SQL is a standardized language used to create, retrieve, update, and delete data within databases. It consists of various commands categorized into Data Definition Language (DDL), Data Manipulation Language (DML), Data Control Language (DCL), and Transaction Control Language (TCL). SQL enables users to define database structures, query data efficiently, and enforce security through permissions and access controls. Widely used in applications ranging from small-scale software to enterprise-level systems, SQL is essential for database administrators, developers, and data analysts.