Practice Queries Online in a Real Playground

SQLTest.online Playground lets you write, run, and troubleshoot queries directly in your browser. Switch between MariaDB, MySQL, PostgreSQL, SQLite, Microsoft SQL Server, Oracle, and Firebird to test syntax differences, validate ideas, and prepare for interviews, coursework, or real application work.

At a glance

Browser-based editor with instant execution and immediate feedback.
Switch across seven database engines from one interface to compare behavior.
Useful for interview prep, coursework, query prototyping, and debugging.
No local database installation required to start practicing.

Why use this playground

Run queries instantly without installing a database server on your machine.
Compare how common statements behave across multiple database engines from one interface.
Prototype queries, debug errors, and learn faster with immediate feedback.

Supported databases

The playground currently includes MariaDB, MySQL, PostgreSQL, SQLite, Microsoft SQL Server, Oracle, and Firebird. That makes it useful both for vendor-specific practice and for cross-database verification before moving a query into production code.

Best for learning, debugging, and query validation

Use this page to practice SELECT statements, joins, aggregations, subqueries, filtering, sorting, and window functions. It is a practical place to refine a query before you add it to an application, dashboard, migration, or report.

Frequently asked questions

Which databases are supported?

The playground supports MariaDB, MySQL, PostgreSQL, SQLite, Microsoft SQL Server, Oracle, and Firebird.

Can I compare syntax across database engines?

Yes. You can run similar queries in different engines to check syntax and behavior differences before shipping code.

Do I need to install a database locally?

No. You can write and run queries directly in your browser without installing a local database server.