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Relationship type defines a set of associations or a relationship set among a given set of entity types.
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Tuesday, May 13, 2008
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It specifies user views and their mappings to the conceptual schema.
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Tuesday, May 13, 2008
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A data base schema is specifies by a set of definitions expressed by a special language called DDL.
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Tuesday, May 13, 2008
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It is the number of entity type participating.
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Tuesday, May 13, 2008
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This language is to specify the internal schema. This language may specify the mapping between two schemas.
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Tuesday, May 13, 2008
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The collection (or set) of similar relationships.
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Tuesday, May 13, 2008
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It is an association among two or more entities.
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Tuesday, May 13, 2008