The document provides an overview of entity-relationship (E-R) modeling concepts including: - Entity sets represent collections of real-world entities that share common properties - Relationship sets define associations between entity sets - Attributes provide additional information about entities and relationships - Keys uniquely identify entities and relationships - Cardinalities constrain how entities can participate in relationships - E-R diagrams visually depict entity sets, attributes, relationships and constraints.

3. Entity Sets customer and loan customer-id customer- customer- customer- loan- amount name street city number

5. Composite Attributes

7. Relationship Set borrower

11. Mapping Cardinalities One to one One to many Note: Some elements in A and B may not be mapped to any elements in the other set

12. Mapping Cardinalities Many to one Many to many Note: Some elements in A and B may not be mapped to any elements in the other set

15. E-R Diagram With Composite, Multivalued, and Derived Attributes

16. Relationship Sets with Attributes

26. E-R Diagram with a Ternary Relationship

32. How about doing an ER design interactively on the board? Suggest an application to be modeled.

38. Specialization Example

45. E-R Diagram With Aggregation

47. E-R Diagram for a Banking Enterprise

48. How about doing another ER design interactively on the board?

49. Summary of Symbols Used in E-R Notation

50. Summary of Symbols (Cont.)

51. Alternative E-R Notations

53. Summary of UML Class Diagram Notation

55. UML Class Diagram Notation (Cont.) * Note reversal of position in cardinality constraint depiction * Generalization can use merged or separate arrows independent of disjoint/overlapping overlapping disjoint

68. End of Chapter 2

69. E-R Diagram for Exercise 2.10

70. E-R Diagram for Exercise 2.15

71. E-R Diagram for Exercise 2.22

72. E-R Diagram for Exercise 2.15