Oracle Internet Academy

Oracle Internet Academy Data Modeling & Relational Database Design Lesson 1: Introduction to Entities, Attributes, & Relationships Contributed by Mike O’Donnell – Adjunct Instructor 2002-2004

1. List six reasons a conceptual model should be created.

2. Of your list from the question above, which reason is the most important? Why?

3. Using your own words, define Entity Relationship Modeling.

4. List four goals of Entity Relationship Modeling.

5. Is Entity Relationship Modeling tied to any specific type of database? If so, which type? If not, why?

6. Give three examples of entities a school would use in a database.

7. Of the three examples of entities from the question above, give two example instances for each.

8. How is Set Theory related to Entities?

9. Define Attribute.

10. Can an attribute have more than one value at any one time? Why is this important?

11. Give an example of a volatile attribute.

12. Define Relationship.

13. List a relationship between any of the entities you wrote for Question 6, above.

14. How is the term Entity Relationship Model (ERM) logically connected to Entity Relationship Diagram(ERD)?

15. List three rules for graphically representing an Entity in an ERD.

16. Where do Entities lead in the design of a relational database?

17. How do you differentiate between attributes that are mandatory and attributes that are optional?

18. Where do Attributes lead in the design of a relational database?

19. How are Relationships graphically represented in an ERD?

20. What does the shape of the end of the relationship line represent? How?

21. How do you differentiate between Mandatory and Optional Relationships?

22. Where do Relationships lead in the design of a relational database?

D:\Docs\2018-04-08\09b162ba760fcc0c628125fd8e039a4f.doc 23. How are business functions connected to the data model?

D:\Docs\2018-04-08\09b162ba760fcc0c628125fd8e039a4f.doc