SQL Playground

Run real SQL against an in-browser SQLite database — genuine execution via sql.js (SQLite compiled to WebAssembly), not a simulator. Write schema/setup SQL, run queries and see real result sets or SQLite error messages, run EXPLAIN QUERY PLAN for real query plans, and browse live schema metadata via sqlite_master and PRAGMA introspection.

Loading the SQL engine (sql.js WASM)…

SQL Playground

Common uses

Run a SELECT, JOIN, or window function query against a real SQLite database
See a genuine SQLite error message for an invalid query
Run EXPLAIN QUERY PLAN to see how SQLite would execute a query
Browse live table/column/foreign-key metadata after running your own CREATE TABLE statements

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Frequently asked questions

Is this real SQL execution or a simulator?

It is real: SQLite compiled to WebAssembly via sql.js runs in your browser, so you get genuine result sets and SQLite error messages.

How do I see a query plan in SQLite?

Click Explain next to Run in the Query tab to run EXPLAIN QUERY PLAN and see how SQLite would execute your query, as a tree or a table.

Can I generate an ER diagram from CREATE TABLE statements?

Yes, the ER Diagram tab draws one from your schema. The Schema Browser also lists tables, columns and foreign keys.

Can I use window functions and joins?

Yes, any SQL that SQLite supports, including JOINs and window functions, can be run against the in-memory database.

Is my data uploaded to a server?

No. This tool runs entirely in your browser — your input is processed locally on your device and is never uploaded or stored on a server.