DATA - Data Governance > Data Architecture and Tools > Modeling Data dictionaries > Data Model > Constraints
Constraints
*A constraint is a declaration that establishes a restriction or business rule that must be applied on execution of processing.
Most constraints involve associations between entities.
Examples of constraints:
The person in charge of a department must belong to the department.
Any invoiced order must already have been delivered.
The delivery date must be later than the order date.
A sensor covering a zone can trigger an alarm for that zone only.
To create a constraint:
1. In the diagram insert toolbar, click the Constraint button.
2. Then click one of the associations concerned by the constraint, and drag the mouse to the second association before releasing the mouse button.
The Add constraint dialog box opens.
3. Enter the name of the constraint, then click Add.
The constraint then appears in the drawing.
*Save your work regularly using the Save button