The collection (or set) of similar relationships.
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Microsoft SharePoint Products and Technologies (including SharePoint Portal Server and
Windows SharePoint Services) deliver highly scalable collaboration solutions with flexible
deployment and management tools. Windows SharePoint Services provides sites for team
collaboration, while Share Point Portal Server connects these sites, people, and business processes
-facilitating knowledge sharing and smart organizations. SharePoint Portal Server also extends
the capabilities of Windows SharePoint Services by providing organizational and management
tools for SharePoint sites, and by enabling teams to publish information to the entire organization.
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The are three levels of abstraction:
Physical level: The lowest level of abstraction describes how data are stored.
Logical level: The next higher level of abstraction, describes what data are stored in database and what relationship among those data.
View level: The highest level of abstraction describes only part of entire database.
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This data model is based on real world that consists of basic objects called entities and of relationship among these objects. Entities are described in a database by a set of attributes.
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It is an association among two or more entities.
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It is the number of entity type participating.
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