Clicking this action item launches the Connect to Database Wizard. From this wizard, you can select a predefined connection. A new SQL Editor tab is launched.
If you already have created a connection to a database, it will appear in this panel as an icon. Double-clicking the icon directly launches an SQL Editor tab, and connects you to the database as defined by the connection.
To read more about the SQL Editor, see Section 6.7, “SQL Editor”.