SQLBolt is a set of short, interactive lessons that each introduce one idea and then have you write queries against a small table right in the browser. There's nothing to install, no account to create, and no video to sit through — just read, type, and check. You can finish the core lessons in an afternoon, and by the end you'll be comfortable with filtering, sorting, joins, and aggregates. Follow it with SQL Murder Mystery or Select Star SQL for practice that feels less like homework.
SQLBolt·~3 hours
Alex Petrov on storage engines and distributed algorithms. A natural companion to CMU 15-445.
Real PostgreSQL, Bash, and Git in a virtual environment. Closer to actual work than browser drills.
Old-fashioned but reliable practice problems with instant feedback. Good for drilling.
SQLZoo
Jose Portilla's PostgreSQL course. Clear and practical, with plenty of exercises.
Kleppmann's modern classic on replication, partitioning, and consistency. Changes how you design systems.
Window functions, CTEs, and newer standard features, with notes on which databases support them.
Markus Winand
Andy Pavlo on storage, indexing, and transactions inside a database. Lectures are free online.
Carnegie Mellon University
The official tutorial for the database most new projects choose. Short and authoritative.
PostgreSQL
Codecademy's free SQL course. Well-paced lessons in the browser, no database setup needed.
A structured, graded introduction aimed at analysts. Good if you want a certificate.
Markus Winand on indexes and query performance. Every developer who writes SQL should read it.
Markus Winand
An interactive book built on one real dataset. Teaches you to think in queries.
Select Star SQL
Solve a crime by querying a database. A fun, surprisingly effective way to practise joins.
Northwestern Knight Lab
Friendly talk-through lessons for complete beginners, with in-browser practice after each.
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Course availability, level, and pricing are set by the provider and can change. Verify on the provider's site before enrolling.
