The document provides an overview of entity-relationship (ER) modeling concepts including: - Entity sets represent collections of real-world objects or concepts that share common properties - Relationship sets represent associations between entity sets - ER diagrams use graphical symbols like rectangles, diamonds, and lines to represent entity sets, relationship sets, and attributes - Mapping cardinalities define the number of entities in one set that can be associated with entities in another set through a relationship - Keys uniquely identify entities and relationships and primary keys are selected from candidate keys

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

37. Specialization Example

44. E-R Diagram With Aggregation

46. E-R Diagram for a Banking Enterprise

47. Summary of Symbols Used in E-R Notation

48. Summary of Symbols (Cont.)

49. Alternative E-R Notations