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17 Cards in this Set
- Front
- Back
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Form |
A business document that contains some predefined data and may include some areas where additional data are to be filled in |
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Report |
A business document that contains only predefined data |
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Entity-Relationship (E-R) Diagram |
A detailed, logical, and graphical representation of the entities, associations and data elements for an organization or business |
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Entity |
A person, place, object, event or concept in the user environment about which the organization wishes to maintain data |
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Entity Type |
A collection of entities that share common properties or characteristics |
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Entity Instance |
Single occurrence of an entity type |
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Attribute |
A named property or characteristic of an entity that is of interest to an organization |
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Candidate key |
Attribute (or combination of attributes) that uniquely identifies each instance of an entity type |
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Identifier |
A candidate key that has been selected as the unique identifying characteristic for an entity type |
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Multivalued Attribute |
An attribute that may take on more than one value for each entity instance |
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Relationship |
An association between the instances of one or more entity types that is of interest to the organization |
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Degree |
Number of entity types that participate in a relationship |
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Unary |
A relationship between the instances of one entity type |
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Binary |
A relationship between the instances of two entity types |
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Ternary |
A simultaneous relationship among the instances of three entity types |
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Cardinality |
The number of instances of entity B that can be associated with each instance of entity A |
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Associative Entity |
An entity type that associates the instances of one or more entity types and contains attributes that are peculiar to the relationship between those entity instances |
