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15 Cards in this Set
- Front
- Back
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A data model is a:
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A formal way of representing the data that are used and created by a business system
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ERD is an acronym for:
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Entity Relationship Diagramming
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An entity relationship diagram (ERD):
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Is a picture that shows the information that is created, stored and used by a business system
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Information in the data dictionary is called: _______________
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Metadata
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When normalizing data models, if you take attributes that have multiple values for a single instance of an entity and create separate entities for those attributes you are moving from:
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O normal form to 1st normal form (1NF)
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During the analysis phase, analysts create programming models to represent how the business system will operate.
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True
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ERD's are drawn in several levels: Context ERD diagrams; Level 0 ERD diarams; Level 1 ERD diagrams.
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False
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Relationships are associations between entities.
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True
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ERD's can be quite complex and might have hundreds or thousands of entities.
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True
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Normalizing data models is a five step process: not-normalized; create first normal form (1NF); create second normal form (2NF); create third normal form (3NF); create fourth normal form (4NF) and finally create the fully normalized form (5NF).
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False
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What are the three primary components of an ERD diagram?
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Entity, attributes, and relationships
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In creating ERD's, which would most likely NOT be a source for entities?
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Cost / Benefit Reports
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Relationships are best documented as a verb in an ERD
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True
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Entities are best documented as a noun in an ERD
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True
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You should create an ERD without consulting the DFD's
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False
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