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SQLtest.online

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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.

Sample databases

These databases are available in the playground read-only. Each one has a page with its schema, sample queries and exercises:

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.

My snippets

Save Your SQL Queries Online

Sign in to save queries from the SQL playground and come back to them later. A saved snippet keeps the SQL code together with the database it runs on: MySQL, MariaDB, PostgreSQL, SQL Server, Oracle, SQLite or Firebird.

  • Your own SQL library. Keep useful queries, templates and solutions in one place instead of scattered text files.
  • Open in one click. A snippet opens in the online SQL editor with its database version already selected, ready to run.
  • Search and sort. Find a query by name or database; the list shows when each snippet was last changed.
  • On any device. Snippets are stored in your account, not in the browser, so they are there on your laptop and your phone.
  • Free. Up to 200 snippets per account, like the rest of the playground, at no cost.