A six-month academy · fully offline · every query runs live
Learn SQL the way engines actually think.
Twenty-four lessons. One real database, embedded in this page. You will type queries, break them, fix them, and watch results appear — from your first SELECT to execution plans, window functions, and schema design. No installs. No internet. No shortcuts to mastery, just a very good road.
The six-month map
Tap any lesson to open it. Finished lessons fill in.
Recall Vault
Questions you have met come back here on a schedule. Clear what is due.
The practice database
Every lesson queries this one shop. You will know it like your own house.