Bogdan Shishedjiev Conceptual Data Model

1

Conceptual Data Model 2

Constraints

History

Analytical Model

Bogdan Shishedjiev Conceptual Data Model 2

Constraints

• Types– Assembly

– Stability

– Subtyping• Disjoin

• Cover

Bogdan Shishedjiev Conceptual Data Model 3

Assembly Constraints

• Inclusion

{[Takes exam] [enrolls]}

Bogdan Shishedjiev Conceptual Data Model 4

Assembly Constraints

• Totality

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Assembly Constraints

• Exclusivity

{not ([enrolls] and [candidate])}

Bogdan Shishedjiev Conceptual Data Model 6

Assembly Constraints

• Equality

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Assembly Constraints

• XOR

Bogdan Shishedjiev Conceptual Data Model 8

Stability Constraints

• Association stability

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Stability Constraints

• Link stability

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Stability Constraints

• Attribute Stability

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Subtype Constraints

• Disjoint– Every instance is in a only one subtype

• Cover– All instances are in subtypes

Bogdan Shishedjiev Conceptual Data Model 12

Case Study - Policlinic

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Case Study - Policlinic

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Historicizing

• Historicizing an attribute

Bogdan Shishedjiev Conceptual Data Model 15

Example – A Repair Company

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Example – A Repair Company

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Example – A Repair Company

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Example – A Repair Company

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Example – A Repair Company

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Example – A Repair Company