DataReady

Free foreverRuns in your browserNo account needed to startMIT + CC BY 4.0

Run real queries, not slides.

Every lesson has a live editor. Write SQL, run it on real tables, and see the results instantly. The same hands-on approach runs through Terminal and Git.

Try your first query

SQL editor

SELECT category,
       SUM(revenue) AS total
FROM sales
GROUP BY category
ORDER BY total DESC;

categorytotal

electronics48,920

home & garden31,540

sports22,180

A clear path from zero to job-ready.

Three tracks, sequenced so each lesson builds on the last. Start anywhere, finish everything.

SQL

31 lessons + 10 practice exams

The language every data job runs on. Start from your first SELECT and build all the way to window functions.

SELECT & WHEREJoinsAggregationWindow functionsCTEs & subqueriesDate functions10 practice exams

Start SQL

Terminal

19 lessons

Get comfortable on the command line: move around, manage files, and chain commands like a pro.

NavigationFiles & directoriesReading filesCapstone

Start Terminal

Git & GitHub

19 lessons

Version control from scratch to your first merged pull request on a real open-source project.

CommitsBranches & PRsMerge conflictsRebasingOpen-source workflow

Start Git & GitHub

Built to make the skills stick.

Reading about SQL is not the same as writing it. DataReady is built around doing.

A live editor in every lesson

Write real SQL and shell commands and run them in your browser. Nothing to install, nothing to configure.

Hands-on exercises

Each concept comes with practice tasks that check your answer against real data as you type.

Practice exams

Ten timed-style SQL exams let you prove the skills stuck before you move on.

Progress that follows you

Start learning today. It's free.

Open the first lesson and run your first query in the next two minutes.

Start with SQL

Found a problem in a lesson?