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22 Cards in this Set
- Front
- Back
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Subtype
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A grouping of the entities in an entity that is meaningful to the organization and that shares common attributes or relationships distinct from other subgroups
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Supertype
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A generic entity that has a relationship with one or more subtypes
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Attribute Inheritance
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A property by which subtype entities inherit values of all relationships of the supertype
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Generalization
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The process of defining a more general entity type from a set of more specialized entity types
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Specialization
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The process of defining one or more subtypes of the supertype and forming supertype/subtype relationships
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Completeness Constraint
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A type of constraint that address the question whether an instance of a supertype must also be a member of at least one subtype
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Total Specialization rule
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Specifies that each entity instance of the supertype must be a member of some subtype in the relationship
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Partial Specialization rule
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specifies that an entity instance of the supertype is allowed not to belong to any subtype
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Disjointness Constraint
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A constraint that address the question whether an instance of a supertype may simultaneously be a member of two (or more) subtypes
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Disjoint rule
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A rule that specifies that an instance of a supertype may not simultaneously be a member of two (or more) subtypes
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Overlap rule
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A rule that specifies that an instance of a supertype may simultaneously be a member of two (or more) subtypes
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Subtype discriminator
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An attribute of the supertyype whose values determine the target subtype or subtypes
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Supertype/subtype hierarchy
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A hierarchical arrangement of supertypes and subtypes, where each subtype has only one supertype
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Entity cluster
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A set of one or more entity types and associated relationships grouped into a single abstract entity
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Universal data model
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A generic or template data model that can be reused as a starting point for a data modeling project
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Derivation
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A statement derived from other knowledge in the buiness
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Structural assertion
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a statement that expresses some aspect of the static structure of the organization
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action assertion
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A statement of a constraint or control on the actions of the organization
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Derived fact
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a fact that is derived from business rues using an algorithm or inference
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Anchor object
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a business rule (a fact) on which actions are limited
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action
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An operation, such as create, delete, update, or read, which may be performed on data objects
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Corresponding object
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A business rule ( a fact) that influences the ability to perform an action on another business rule
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