The five relationship tools are used to represent the following relationships:
One-to-many nonidentifying relationships
One-to-one nonidentifying relationships
One-to-many identifying relationships
One-to-one identifying relationships
Many-to-many identifying relationships
These tools appear at the bottom of the vertical tool bar. Hover the mouse pointer over each tool to see a text hint that describes its function.
For more information about relationships, see Section 7.7.2, “Creating Foreign Key Relationships”.