Advances in Computers, Vol. 35 by Marshall C. Yovits

By Marshall C. Yovits

This quantity in a chain detailing thoughts in all facets of desktop technological know-how, is worried with relational databases, tactile info processing and research, object-oriented approach improvement equipment; opposite engineering, multiprocessing, foreign computing, and others.

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Input to the design approach are the individual requirements documents of the potential users of the database that specify data and functional requirements. Performing a joint data- and function-driven design has two main advantages. First, as a conceptual schema is derived by performing iterative refinements on the schema, these refinements are simplified if data and function specifications are produced together because they are influencing each other. For instance, refinements on the data schema can suggest refinements on the functional schema, which in turn can suggest refinements on the D-schema.

13(a). Note that in this example it is necessary to establish a correspondence among key values for each entity in the generalization hierarchy. The correspondence would be used when the database is actually populated, For example, a correspondence would be, that the graduate student “John MacWell” associated to department “Computer Science” is the same student as the student with SNo = 123. Overlapping RWS. In the case of overlapping RWS of El and Ez, the integrated schema will contain three entity types.

16 S. 1. B. NAVATHE AND G. PERNUL Entity Description Name: Estimated Cardinality: Integrity Constraints: Description: Attribute Description Attribute Name: Description: Domain: Restrictions on the Do& 0 Valueset: Predicate: Existence Dependency: Null value allowed: Repetition factor of the value within entity typC: Number of unique values within entity type: Unique Identifier (Yes/No): Interdependencywith foUowing other attributes: Relationship description Relationship Name: Description of Relationship Participating Entity Types: Degree of the Relationship: Connectivity (with all participating Entity Types): Mandatory / Optional: Attributes of the relationship type Attribute Name: Description: Domain: Restrictions on the Domain 0 Valueset: Predicate: Existence Dependency: Null value allowed: Repetition factor of the value within relationship type: Number of unique values within relationship typc: .

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Advances in Computers, Vol. 35 by Marshall C. Yovits
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