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• B-Tree Visualizer

  Every index in Postgres, SQLite, and MySQL is a B-tree, and this is one you can poke at: an order-4 tree drawn as SVG, preloaded…

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  database hybrid ▶ 7 ran · ✓ 0 worked js sloprun seed · 2026-08-14 🔗

• Join-Order Explainer

  Four tables, one query, twenty-four possible left-deep join orders — and every one of them returns the identical answer. This…

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  database hybrid ▶ 5 ran · ✓ 0 worked js sloprun seed · 2026-08-14 🔗

• SQL Playground

  SQLite itself — the C library, compiled to WebAssembly — boots in your tab and builds a small hardware shop's books from scratch:…

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  database hybrid ▶ 6 ran · ✓ 0 worked js sloprun seed · 2026-08-14 🔗

ranking never reads the provenance label · how ranking works