SQL Playground

What is this SQL Playground?

This is a genuine SQLite database compiled to WebAssembly and run entirely inside your browser tab via sql.js. There’s no backend involved — no server executes your SQL, no query text is ever sent anywhere. Close the tab or reload the page and the database resets to its seeded starting state.

It’s useful for trying out a JOIN, testing a GROUP BY/aggregate query, checking SQLite-specific syntax before running it against a real database, or just practicing SQL without installing anything. The seed schema has two related tables — users and orders — so you can try joins, aggregations, filtering, and subqueries against realistic (if tiny) relational data.

For real databases — Postgres, MySQL, SQLite files on disk, DuckDB, Cloudflare D1, and more — with a full schema browser, visual ERD, and an AI assistant, see rdSQL Desktop, or browse the rest of the free SQL tools.