Global authority - PowerPoint PPT Presentation

Constraints in Entity-Relationship Models

Constraints in Entity-Relationship Models. Zaki Malik September 18, 2008. Types of Constraints. Keys are attributes or sets of attributes that uniquely identify an entity within its entity set. Single-value constraints require that a value be unique in certain contexts.

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Introducing the International Authentication Association (IAA)

Introducing the International Authentication Association (IAA). The IAA Vision. The global authority on counterfeit detection and product authentication

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169 views • 6 slides

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