About SQL Practice

Why this exists

Setting up a local database just to practice a few SQL queries is friction most learners don't need. SQL Practice removes that step: open the page, and you already have five related sample tables (Employees, Departments, Customers, Products, Orders) loaded and ready. Write a query, run it, see the result — that's the whole loop.

How it works

The entire application runs inside your browser tab. Queries are parsed and executed by an in-memory JavaScript SQL engine (AlaSQL) — there is no backend server, and no database that stores your queries. Refresh the page and the sample data resets to its original state, exactly as if you'd just opened it for the first time.

What you can do here

• Run SELECT, JOIN, GROUP BY, subqueries, INSERT, UPDATE and DELETE against realistic sample data
• Paste messy, unformatted SQL into the Formatter and get clean, consistently indented code back
• Browse the tutorials to learn or refresh core SQL concepts

Support the site

SQL Practice is free to use and supported by advertising, which helps cover hosting and ongoing development. See our Privacy Policy for details on how ads and analytics, when enabled, may use cookies.