Chapter 4 Building Conceptual Data Models

Designating a primary identifier

A primary identifier is an identifier that has been designated as the main identifier for the entity. It generates a primary key in a PDM.

To designate a primary identifier:

1. Double-click an entity in the diagram to display the entity property sheet.
2. Click the Identifiers tab to display the corresponding page.
   
   It lists the Identifiers defined for the entity.
3. Select an identifier from the list.
   
   An arrow appears at the beginning of the line.
4. Click the Property tool.
   
   or
   
   Double-click the arrow at the beginning of the line.
   
   The identifier property sheet appears.
   
5. Select the Primary Identifier check box.
6. Click OK.
   
   You return to the Identifiers page. The P column is selected for the new primary identifier.
   
   
      Item not visible in list
   To make an item visible in a list, click the Customize Columns and Filter tool in the list toolbar, select the appropriate check box from the list of filter options that appears, and click OK.
   
   
7. Click OK.

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