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Similaire à Lecture 03 data abstraction and er model
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Lecture 03 data abstraction and er model
- 1. Lecture 3 Entity Relationship (E-R) Modeling
- 4. Data Models: Degrees of Data Abstraction Figure 3.1
- 12. Connectivity and Cardinality in an ERD Figure 3.12
- 17. Three Types of Relationships Figure 3.21
- 19. Composite Entities (con’t.) Figure 3.31
- 21. Generalization Hierarchy with Overlapping Subtypes Figure 3.35
- 23. Comparison of E-R Modeling Symbols Figure 3.36
- 25. Supertype/Subtype Relationship in an ERD Figure 3.42
- 26. First ERD Segment Established Figure 3.43
- 27. Second and Third ERD Segments Established Figures 3.44 & 3.45
- 28. Fourth and Fifth ERD Segments Established Figures 3.46 & 3.47
- 29. Sixth and Seventh ERD Segments Established Figures 3.48 & 3.49
- 30. Eighth ERD Segment Established Figures 3.50
- 31. Ninth ERD Segment Established Figures 3.51
- 32. Components of E-R Model Table 3.2
- 33. Completed ERD Figure 3.52