Week 4-Problems and Exercises_CH

Week 4-Problems and Exercises_CH

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Week 4: Problems and Exercises 5. Consider the E-R diagram in Figure 7-20 . Based on this E-R diagram, answer the following questions: a. How many EMPLOYEES can work on a project? Based on the below diagram it shows many to many which means that several employee can work on several projects b. What is the degree of the Used_on relationship? The zero through the line means a minimum cardinality of zero, whereas the crow’s-foot notation means a “many” maximum cardinality (Hoffer 204) Jeff A. Essentials of Systems Analysis and Design, VitalSource eBook for DeVry University. Pearson Learning Solutions, 02/2012. VitalBook file. c. Do any associative entities appear in this diagram? If so, name them . The Work_on is the only associate entity d. How else could the attribute Skill be modeled? It could be modeled as part of the Work on entity. e. What attributes might be attached to the Works_on relationship? None can be assigned to the Work_on because it is not an entity.
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.
  • Spring '11
  • New
  • Entity-relationship model, Pearson Learning Solutions, Associative Entities, Jeff A. Essentials, University. Pearson Learning

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern