Diagrams can be created by simply dragging objects from the Object Browser to the Diagram Window. Foreign key relations between tables will automatically be included, and you can explicitly include dependency relations. You can also add your own custom relations between objects. You can show and hide specific items for an object types, such as keys and indexes, and you can also control which column properties are displayed.
To add additional structure to complex diagrams, you can add object groups. In the example above, a "Sequences" group has been added to group the sequences on the diagram.