Add an Exclusive Subtype Relationship
Add an exclusive subtype relationship in a logical model so that an attribute in the subtype entity can derive its value from only one subtype entity.
To add an exclusive subtype relationship
- Click
on the erwin Toolbox.
The cursor changes.
- Click the parent entity in the relationship, then click the first child entity.
The relationship is created.
- Click
on the erwin Toolbox, click the
symbol, then click a child entity.
A subtype is added. Repeat for each child entity that you want to add as a subtype.
- Right-click the
symbol, and then click Subtype Properties.
The Subtype Properties dialog opens.
- Select the Exclusive option and click OK.
The exclusive subtype relationship is added and the Subtype Properties dialog closes.
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