Beginner friendly

SQL

The standard query language for relational databases — used to store, retrieve, combine, and analyze data in systems such as PostgreSQL, MySQL, SQLite, and SQL Server. Essential for back-end developers, data analysts, and data scientists alike.

65 lessons ~5h 32m to complete Beginner → Advanced Free, no signup

Backend & Enterprise Data & Scientific Database & Query Languages

Difficulty: Beginner
Version: SQL:2023
Website: Visit site
Docs: Read docs

What you'll learn

A complete path from the basics to production-ready skills — work through it in order, at your own pace.

1 Level 1 — Beginner 27 lessons
2 Beginner Projects 1 lesson
3 Level 2 — Intermediate 18 lessons
4 Intermediate Projects 1 lesson
5 Level 3 — Advanced 16 lessons
6 Advanced Projects 1 lesson
7 What You Should Know Now — and What's Next 1 lesson

Ready to start learning SQL?

No prior programming experience required — every lesson starts from the basics.

Start Learning SQL View Cheat Sheet

Related developer tools

Practice what you learn with these free tools.

SQL Formatter

Break a single-line SQL query onto readable, indented lines.

JSON Formatter

Pretty-print and indent minified or messy JSON.

Code Difference Comparison Tool

Compare two blocks of text or code line by line.

Related languages

Python

A general-purpose language known for readable syntax and a huge ecosystem, widely used for web backe...

R

A language built for statistics and data analysis — widely used by data scientists, statisticians, a...

PHP

A widely-used server-side scripting language especially suited for web development, powering platfor...

SQL