Key Features of SQL Playground
- WebAssembly SQLite Sandbox Execute raw SQL statements completely offline using a local SQLite engine.
- Clean Data Tables View Visualize SELECT query rows, schemas, and values in structured tables.
- Complete DDL and DML support Create, alter, and delete databases, alongside insert and query operations.
SQL Playground Examples
Create and Query a Table
Initialize a simple table, insert a row, and select the output.
Input
CREATE TABLE users (id INT, name TEXT);
INSERT INTO users VALUES (1, 'Alice');
SELECT * FROM users;Output
[Data table displaying 1 row: ID=1, Name=Alice]How to Use SQL Playground
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1. Write SQL Queries
Type CREATE TABLE, INSERT, SELECT, JOIN, or any SQL statement in the editor.
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2. Execute
Click Run or press ⌘↵. Queries run against an in-memory SQLite database.
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3. Read Results
Each SELECT query renders an interactive result table below the editor.
Common Use Cases for SQL Playground
- Learning SQL Commands Practice basic queries, WHERE clauses, and aggregate operations.
- Prototyping Relational Joins Verify INNER, LEFT, or RIGHT JOIN queries across custom schemas.
- Evaluating Indexing and Schema Designs Test table generation, constraints, foreign keys, and indices.
The Technical Details
The SQL Playground embeds a compiled WebAssembly SQLite database engine. All schemas, creations, queries, and transactions run fully in-memory locally inside your browser sandbox.
Frequently Asked Questions
Which SQL dialect is supported?
SQLite: a lightweight, full-featured SQL engine running via WebAssembly in your browser.
Does it need an internet connection?
Only to load the SQLite WASM file on first visit. After that, all queries run locally offline.
Is the database persisted between sessions?
No. The in-memory database is reset on every page reload. Export your data before closing.
Can I run multiple statements?
Yes. Separate multiple SQL statements with semicolons and all will execute in order.