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Data Modeling Made Simple with ER/Studio Data Architect by Steve Hoberman

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There are three terms within this definition that require an explanation: unique, identifier, and Customer.

The term unique is ambiguous and could easily be interpreted differently by readers of this definition. To maintain clarity and correctness, these questions should be answered within the definition:

·         Are identifier values ever reused?

·         What is the scope of uniqueness?

·         How is the identifier validated?

We can describe the actual identifier in more detail by addressing these areas:

·         Purpose. For example, perhaps the identifier is needed because there are multiple source systems for ...

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