midterm review - Chapter 4: REA pattern: independent of any...

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Chapter 4: REA pattern: independent of any modeling notation. Can be communicated using: o Narrative descriptions. o Diagrams of various types o Structured Grammar o Predicate logic notation o Tags such as are used in XML, and XBRL o Programming language notation Entity: a real world object that has a separate physical or conceptual existence. Ex, Vendor Relationship: an association between entities. May possess characteristics of their own. Attribute: a characteristic possessed by an entity or a relationship. Primary Key Attribute: used to uniquely and universally describe each instance of an entity or relationship. Concentrated Primary Key: A combination of two attributes to form a primary key. Simple attribute: attribute that cannot be further decomposed. Composite attribute: may be decomposed into other attributes. Derivable attribute: an attribute that can be derived/computed from the values of other attributes in the database. Ex Overall GPA o Static Derivable: derived value will not change if new data is entered. o
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midterm review - Chapter 4: REA pattern: independent of any...

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