Courses

Everything we have finished.

We build one course at a time and finish it before starting the next. That is why this list is short, and why the thing on it is done.

SQL Day by Day

Open now

From SELECT to reading a query plan

Every answer runs against a real Postgres in your browser and gets checked. Built for the interview you are going to sit, and the job after it.

48 days · 241 problems · free

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More are coming. They show up here when they are as done as this one, not before. If we listed everything we intend to build, this page would be a wish list rather than a catalogue.

Levich Academy · levich.co