Add a non-identifying relationship in a logical model to show the relationship between two entities in which an instance of the child entity is not identified through its association with a parent entity, which means the child entity is not dependent on the parent entity for its identity and can exist without it. Primary key attributes are automatically migrated from a parent entity to a child entity, so you do not need to enter any foreign keys in the child. The relationship is automatically created with nulls allowed in the parent. To create a mandatory non-identifying relationship, click the No Nulls button in the Relationships editor.
To add a non-identifying relationship
in the erwin Toolbox.
The cursor changes from the arrow symbol to the non-identifying relationship symbol.
The non-identifying relationship is added.
|
Copyright © 2017 erwin Inc.
All rights reserved.
|
|
