SQL Tutorial – Introduction

What is SQL?

SQL (Structured Query Language) is the standard language for relational database management systems. It allows you to create, read, update, and delete data stored in tables.

Basic Concepts

• Database: A collection of related data.
• Table: A set of rows and columns representing data.
• Row (Record): A single entry in a table.
• Column (Field): A specific attribute of a record.

Simple SELECT Example

SELECT first_name, last_name
FROM employees
WHERE department = 'Sales';

Try It Yourself

Enter a query below to see a preview of the result (simulation only).