SQL Fundamentals

Master the basics of SQL (Structured Query Language) to work with relational databases through this comprehensive tutorial series.

Getting Started

Begin your SQL journey with these sequential tutorials:

1. What is SQL? - Introduction and environment setup
2. Creating Tables - Table structure, data types, and constraints
3. CRUD Operations - Create, Read, Update, Delete operations
4. Advanced Queries - Aggregate functions, grouping, and subqueries
5. Joins and Relationships - Combining data from multiple tables
6. Indexing and Performance - Optimizing database performance
7. Best Practices - Writing clean, maintainable SQL code

Quick Reference

Basic SQL Syntax

-- SQL is case-insensitive but uses uppercase for keywords
SELECT column1, column2 FROM table WHERE condition;

CRUD Operations

-- Create
INSERT INTO users (name, email) VALUES ('John', '[email protected]');

-- Read
SELECT * FROM users WHERE age > 25;

-- Update
UPDATE users SET age = 26 WHERE name = 'John';

-- Delete
DELETE FROM users WHERE name = 'John';

Why Learn SQL?

SQL is essential for:

• Web development (backend databases)
• Data analysis and business intelligence
• Mobile app development
• System administration
• Any career working with data

Prerequisites

• Basic understanding of data concepts
• No programming experience required
• Access to a computer with internet connection

Ready to start? Begin with What is SQL? to set up your practice environment.