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Chapter 05 – Part 2

Chapter 05 – Part 2. Data Modeling with the Entity-Relationship Model. Contents. A. Sales Order Problem B. Solution. A. Sales Order Problem. A company want to computerize all data. The followings are reports:. Let’s design DB diagram for above requirements. B. Solution.

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Chapter 05 – Part 2

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  1. Chapter 05 – Part 2 Data Modeling with the Entity-Relationship Model

  2. Contents A. Sales Order Problem B. Solution

  3. A. Sales Order Problem • A company want to computerize all data. The followings are reports:

  4. Let’s design DB diagram for above requirements

  5. B. Solution • Logical Analysis • Physical Analysis

  6. 1. Logical Analysis 1.1. First solution 1.2. Second solution 1.3. Identify Recursive Relationship

  7. 1.1. First solution 1.1.1. Identify Entity 1.1.2. Identify Attribute 1.1.3. Identify Weak Entity 1.1.4. Identify Primary Identifier 1.1.5. Identify Alternative Identifier 1.1.6. Identify Mandatory Attribute 1.1.7. Identify Relationship

  8. 1.1.1. Identify Entity

  9. 1.1.2. Identify Attribute

  10. 1.1.3. Identify Weak Entity 1.1.3.1. What is Weak Entity? 1.1.3.2. Design using ID-Dependent Entity

  11. 1.1.3.1. What is Weak Entity? • A weak entity is an entity whose existence depends upon another entity. • All ID-Dependent entities are considered weak. • An ID-dependent entity is an entity whose identifier includes the identifier of another entity. • But there are also non-ID-dependent weak entities. • The identifier of the parent does not appear in the identifier of the weak child entity.

  12. 1.1.3.2. Design using ID-Dependent Entity

  13. 1.1.4. Identify Primary Identifier

  14. 1.1.5. Identify Alternative Identifier

  15. 1.1.6. Identify Mandatory Attribute

  16. 1.1.7. Identify Relationship 1.1.7.1. Identify Maximum Cardinality 1.1.7.2. Identify Minimum Cardinality

  17. 1.1.7.1. Identify Maximum Cardinality

  18. 1.1.7.2. Identify Minimum Cardinality

  19. 1.2. Second solution 1.2.1. Identify Entity 1.2.2. Identify Attribute 1.2.3. Identify Primary Identifier 1.2.4. Identify Alternative Identifier 1.2.5. Identify Mandatory Attribute 1.2.6. Identify Relationship

  20. 1.2.1. Identify Entity

  21. 1.2.2. Identify Attribute

  22. 1.2.3. Identify Primary Identifier

  23. 1.2.4. Identify Alternative Identifier

  24. 1.2.5. Identify Mandatory Attribute

  25. 1.2.6. Identify Relationship 1.2.6.1. Identify Maximum Cardinality 1.2.6.2. Identify Minimum Cardinality

  26. 1.2.6.1 Maximum Cardinality on Diagram

  27. 1.2.6.2. Minimum Cardinality on Diagram

  28. 1.3. Identify Recursive Relationship 1.3.1. What is Recursive Relationship? 1.3.2. Recursive Relationship on Diagram

  29. 1.3.1. What is Recursive Relationship? • A recursive relationship occurs when an entity has a relationship to itself. • There are three types of Recursive Relationships: • 1: 1 • 1:N • N:M

  30. 1.3.2. Recursive Relationship on Diagram

  31. 2. Physical Diagram

  32. ?

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