Welcome

SQL Tutorial Library

A comprehensive collection of SQL tutorials, cheat sheets, exercises, practical guides, and projects. Covering everything from SELECT basics to advanced analytics, data warehousing, and performance optimization.

Content Types

Tutorials

In-depth walkthroughs with progressive examples

Cheat Sheets

Dense quick-reference guides for working developers

Exercises

Practice problems with full solutions

Practical Guides

Real business problems solved step by step

Projects

Multi-phase projects building complete solutions

Topics Covered

SQL Fundamentals

SELECT, WHERE, GROUP BY, joins, and core concepts

Analytics & Window Functions

ROW_NUMBER, running totals, cohort analysis, funnels

Database Design

Normalization, constraints, transactions, schemas

Performance

Indexes, execution plans, query optimization

Data Warehousing

Star schemas, ETL, dbt, dimensional modeling

Advanced Patterns

JSON, recursion, gaps-and-islands, full-text search

AND, OR, NOT - Tutorial