Connect to the default memory database with the connection dialogue. Then use the menu and select Option -> Insert Test Data to populate the sample database. The menu item Recent has some SELECT statements to try. You can enter your own data and use your own queries.
The database is running as an applet inside the web browser and all data is kept in memory.
The data will be lost if the browser window is closed.
If the database window does not show, there may be a setup problem.
This demo requires Java 1.6 and has been tested with Mozilla Firefox.