To access data stored in databases and write queries to return data, you must connect to a database.
There are several ways to establish a connection from QMF Visionary. By default, when you launch QMF Visionary, the Select Data Source dialog box prompts you to connect to a data source.
You can also manually open a connection in QMF Visionary (click File --> Connect). You might want to open another connection during the development of a world to connect to a second or third database and retrieve additional data.