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SQL (Structured Query Language) is the standard language for interacting with Relational Database Management Systems (RDBMS). It is used to store, retrieve, manipulate, and manage data in databases such as MySQL, PostgreSQL, Oracle, and SQL Server. SQL works with data stored in tables (rows and columns) and provides commands for defining structures, querying data, and controlling access.
Core SQL Categories:
DDL (Data Definition Language) – Defines and modifies database structures. Examples: CREATE, ALTER, DROP
DML (Data Manipulation Language) – Manages data within tables. Examples: SELECT, INSERT, UPDATE, DELETE
DCL (Data Control Language) – Controls access to data. Examples: GRANT, REVOKE
TCL (Transaction Control Language) – Manages transactions. Examples: COMMIT, ROLLBACK, SAVEPOINT.
Basic SQL Syntax Example:
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SQL is a standard language for storing, manipulating and retrieving data in databases. Our SQL tutorial will teach you how to use SQL in: MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, …
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Nov 5, 2025 · Learn the foundational concepts of SQL, essential for anyone working with relational databases. This section covers the syntax, commands, and key …
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