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Reaver1000

SQL playground on DuckDB WASM: in-browser warehouse + 55 tested templates

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metadata

title: SQL Query Playground
emoji: 🦆
colorFrom: indigo
colorTo: gray
sdk: static
pinned: true
license: mit
short_description: Real SQL against DuckDB WASM — runs in your browser

SQL Query Playground

Write and run real SQL against a seeded warehouse — DuckDB compiled to WebAssembly, executed entirely in your browser. Nothing is uploaded, no server exists: the database, the engine and the results all live on your machine.

55 tested templates — window functions, cohort queries, funnel metrics, date arithmetic — every template is also executed in CI against the same data.
Schema browser for the four-table warehouse (1,000 customers, 5,000 orders, 12,663 line items), seeded deterministically.
Ctrl+Enter to run; query timing and row counts shown on every execution.

Not a simulation: every query is parsed, typed and executed by a real DuckDB engine. Errors surface as data — the way production pipelines treat failures.

Code + template library: sql-query-builder on GitHub
Built by David Buchan — AI, automation and data work