This is a SQL Server demonstration, not a live database.

The demo provides a limited SQL environment designed to demonstrate how SQL Server can display data and return query results. While many common SQL commands are supported, some SQL statements, database operations, and advanced features are not available in this demonstration.

Think of it like a flight simulator: it can show you how many things work, but it isn't the actual airplane.

If your SQL statement isn't supported, the demo will let you know rather than attempting to execute it.

This does not necessarily mean your SQL would fail on a real SQL Server. It simply means that particular feature is outside the capabilities of this demonstration.