I built a tutorial to help you learn Kuberenetes in most simplest way
Playground simulations beat wall-of-text docs, but Kubernetes already has killer tutorials.

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.
Backend developers, data analysts, SQL learners and students who want hands-on practice with real queries
https://seaquel.app/learn-sql is an interactive SQL tutorial with a visual query builder.
JOINs, CTEs, subqueries can be difficult to understand. With the visual builder and SQL editor side-by-side, I hope these concepts are easier to understand.
FWIW, the tutorial is part of Seaquel, the SQL client I've always wished I had. I showed that to HN a few weeks ago.
Curious to hear what you think of the tutorial.
Thanks
Playground simulations beat wall-of-text docs, but Kubernetes already has killer tutorials.
1v1 Arena mode makes practicing SQL joins actually competitive against real players.
Focuses on iterative schema exploration, but LangChain and Vanna already solve this.
Portfolio builder in 5 minutes is convenient, but DataCamp and Coursera already own this space.
Real-time 1v1 SQL duels where fastest correct query wins ranking points on leaderboards.
The UI maps common operators to form fields (site:, inurl:, intitle:, filetype:, after:/before:) and can parse an existing query back into the builder — handy when you inherit someone else's search. It's intentionally tiny and easy to self-host, but it's more a useful utility than a novel product since browser extensions and similar generators already cover this space.