By Computer Associates
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Extra info for ERwin. Getting Started
Example text
Right-click on Attributes and choose New from the context menu. A New Attribute edit box appears under Number. Type “Name” in the edit box and when you’re done click the mouse once outside of the edit box. 4. Using the method that you prefer, add “Phone Number” as a non-key attribute in the CUSTOMER entity. When you’re done, your diagram should look like this: Buddy Tip— To designate an attribute as a primary key, in the Model Explorer, doubleclick on the attribute’s name to open the Attributes editor.
This migration occurs automatically in the physical model. In an identifying relationship, the FK migrates above the line and becomes part of the primary key of the child entity. In a non-identifying relationship, the foreign key migrates below the line and becomes a non-key attribute in the child entity. In ERwin, a dashed line represents a non-identifying relationship. Buddy Tip— If you want a non-key to migrate instead of the primary key, you can use the alternate key migration option. For more information, search for “Alternate Key Migration” in the Online Help system.
1. er1 open, from the Tools menu, select Derive New Model. 2. In the first page of the Derive New Model Wizard, in the Model Type group box, select Physical. In the Create Using Template box, accept the default template, “Blank Physical Model”. In the Target Database list, choose Oracle version 8x. Click Next. doc, printed on 02/07/01, at 3:15 PM Working With Data Models 3. On the second page, accept the default settings in which all objects are selected. 4. On the third page, also accept the default settings and click Finish.