Interactive SQL Tutorial with a visual query builder
The side-by-side visual builder and live SQL editor is the real payoff — drag tables onto a canvas, draw joins, and watch the SQL and results update so JOINs actually click. It's not a novel database, but shipping an in-browser SQL sandbox with a downloadable client, sample e‑commerce dataset, and no-signup access makes this a very effective, demo-friendly way to learn tricky SQL concepts.