SEU Operating Systems Essay

Description

1-Considering the following ER-Diagram, answer the following questions:

a) What is the main role of an ER diagram in data modelling?

b) How many courses each student can have?

c) What is the relationship degree between the entities?

d) Is there an associative entity, if yes can you name it?

e) What is uniquely identifying the student entity table (Primary Key)?

2- Draw a class diagram showing classes, attributes, operations, and relationships. If you believe that you need to make additional assumptions, do so.

Scenario: several employees are working at a company. The attributes of the employees include the employee ID, Employee Name, address, DOB. The company is running different projects. Projects attributes include the project name, the start date and end date.

Each employee may work on one or more projects or may not be assigned to a project. However, each project must be assigned to at least one employee.

Make sure that you identify the PK for each class
Your diagram must include Associative class
Implement Generalization

3- The following INSTRUCTOR relation shows the information of instructors and the training sessions they offer. Each instructor can give any session at a chosen date. Why INSTRUCTOR relation is not in 2NF? How can you convert it be in 2NF?

Instructor_ID	InstructorName	SessionID	Session_Date
1	Ahmad	S1	June 1^st
1	Ahmad	S2	July 1^st
2	Ali	S2	June 1^st
3	Mohammad	S3	August 15^th

4- The following CAR relation is in 3NF. What an attribute that if added to the relation, it would make it not in 3NF? Justify your answer.

CAR (CAR MODEL, CAR_YEAR, DEALERSHIP). Assume that each car model is only sold by one dealership.



^{Have a similar assignment? "Place an order for your assignment and have exceptional work written by our team of experts, guaranteeing you A results."}

Our Service Charter

1. Professional & Expert Writers: Eminence Papers only hires the best. Our writers are specially selected and recruited, after which they undergo further training to perfect their skills for specialization purposes. Moreover, our writers are holders of masters and Ph.D. degrees. They have impressive academic records, besides being native English speakers.

2. Top Quality Papers: Our customers are always guaranteed of papers that exceed their expectations. All our writers have +5 years of experience. This implies that all papers are written by individuals who are experts in their fields. In addition, the quality team reviews all the papers before sending them to the customers.

3. Plagiarism-Free Papers: All papers provided by Eminence Papers are written from scratch. Appropriate referencing and citation of key information are followed. Plagiarism checkers are used by the Quality assurance team and our editors just to double-check that there are no instances of plagiarism.

4. Timely Delivery: Time wasted is equivalent to a failed dedication and commitment. Eminence Papers are known for the timely delivery of any pending customer orders. Customers are well informed of the progress of their papers to ensure they keep track of what the writer is providing before the final draft is sent for grading.

5. Affordable Prices: Our prices are fairly structured to fit in all groups. Any customer willing to place their assignments with us can do so at very affordable prices. In addition, our customers enjoy regular discounts and bonuses.

6. 24/7 Customer Support: At Eminence Papers, we have put in place a team of experts who answer all customer inquiries promptly. The best part is the ever-availability of the team. Customers can make inquiries anytime.