Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN: 9780133594140
Author: James Kurose, Keith Ross
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Related questions
Question
Create an Entity Relationship diagram (ERD) for the following scenario indicating the
identifiers and cardinality constraints.
A division operates many departments, but each department is operated by only one division. Each division must have at least one department and each department must belong to a division. A department employs many employees, but there may be a department with no employees. Division is characterised by Divisionid and Divisionname and the attributes of department include Deptid and Deptname. Majority of employees called “dept_emps” are employed by a department. However, there are also employees known as “free_lance_emps” who are not assigned to any department. A department may own many projects, but there may be a department with no projects. Employee is characterised by empid, empname, emptype and address.
Both dept_emps and free_lance_emps can work on many projects, but there are employees who do not work on any project. A project has at least one employee working on it and it is characterised by a projectcode and projectname. One of dept_emps manages a department. Each department must have a manager. One of the employees runs a division. Each division must have someone running it.
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by stepSolved in 2 steps with 1 images
Knowledge Booster
Similar questions
- PLZ help with the following: Create a Crow’s Foot ERD. Draw YOUR entity relationship diagram (ERD) to indicate entities, relationships, connectives, and resolve M:N relationships. For the following: The faculty and students (we refer to them in our system as clients) can electronically check out any book at any time. A book must have at least one author but can have more authors. An author must have written at least one book or more to be included in the system. A book may have neverbeen checked out, but can be checked out many times by the same client or different clients over time. A client may have never checked out a book or they may have checked out many books over time. To simplify determining which client currently has a given book checked out, a M:N relationship between BOOK and CLIENT should be maintained. The information recorded for each book is book number, book title, book subject, and year of publication. For each author, the library records the author ID,…arrow_forwardDraw clearly from existing scenario text the Entity Relationship Diagram (ERD) “There is a group of employees who have run the website. Three admins are responsible to check registration forms filled by babysitters. An accountant is responsible to check fees payments. All these employees are supervised by the manager. Each babysitter can register on the website one time by filling in her data including first and last names, qualifications, fee rate per hour (25 SAR per Hour), contact information, address, photo, and years of experience. The system will issue for her id and registration date. Mothers can make booking as many as they need. For each time, they must fill in their names, contact information, address, number of children, the date and time (e.g. from 2:00 PM to 4:PM) of booking. The website will generate the booking report including mother’s data, babysitter’s contact data, number of booked hours, fee rate per hour, fees total amount, and tax (%5). To make a…arrow_forwardWhat does an associative entity model? a.) Associative entities model pure relationships rather than entities. b.) Associative entities model entities that are independent. c.) Associative entities model the real-world scenarios of ways to look up data. d.) Associative entities model attributes and how they are linked to entities.arrow_forward
- Prepare an E-R diagram for a real estate firm that lists property for sale. Identify all entities (supertype/subtype), attributes (optional/required), unique identifiers, relationships and relationships cardinality and optionality. Resolve any M-M relationship you find. • The firm has several sales offices in several states. Each sales office has Office_Number and a Location. • Employees are assigned to work in different sales offices. Each employee has an ID and Name. • An employee must be assigned to only one sales office. For each sales office, there is always one employee assigned to manage that office. For each manager we record the start date of the management job. • The firm lists properties for sale. Each property has an ID, description and Location. Each unit of property must be listed with one (and only one) of the sales offices. A sales office may have any number of properties listed. • Each unit of property has one or more owners. owners have ID and Name. An owner may own…arrow_forwardThe Acme Company wants to construct a database to keep track of the company’s employees, departments, and projects as well as the employee’s dependents. Draw the entity-relationship model. The requirements collected to date to be modeled are: The company is organized into departments. Each department has a name, a number, and an employee who manages the department. A department controls a number of projects, each of which has a name, a number, and a start date but not all departments have projects assigned to them. We store each employee’s name, social security number, address, salary, sex, and birth date. Every employee is assigned to a department but may work on several projects, which are not necessarily under the control of the same department. We keep track of the number of hours per week that each employee works on each project. For most projects, a team of employees is assigned to work on the project while some employees are never assigned to a project. We also keep track…arrow_forward1)List all the entities required for requirements given in Figure 1. 2)Draw the complete entity-relationship diagram for requirements given in Figure 1.arrow_forward
- Draw an ERD for the following scenario: A department employs many employees, but each employee is employed by one department. Each employee has the following characteristics: emp_Num, emp_FName, empLName, empAdress. Each department has a code and a name. Some employees, known as “rovers,” are not assigned to any department. A division operates many departments, but each department is operated by one division. Each division has a code and a name. An employee may be assigned many projects, and a project may have many employees assigned to it. Each project has a code and a name. An assignment is characterized by a date and number of hours. A project must have at least one employee assigned to it. One of the employees manages each department, and each department is managed by only one employee. One of the employees runs each division, and each division is run by only one employee.arrow_forwardSuppose that we wish to keep a genealogy. The information we wish to record about each person includes their name, date of birth, phone number, and degrees obtained . We also need to keep track of the mother, father, and children of each person. Draw a complete Entity-Relationship diagram. You must include all the details, sad as keys, weak entities (if any), cardinality constraints, etc. Your diagram must avoid redundancy.arrow_forwardDraw three sequence diagrams for three use cases in the use case diagram attached. Please draw the sequence diagram similar to the attatched second photo.arrow_forward
- 4. Transform the PARTNER supertype in the following model for a DJ business, using Single-Table/Supertype Implementation. supervise 1 PARTNER #id *first name *last name EVENT PLANNER *expertise PO DJ *specialty MANAGER authorized expense limit OTHER supervised byarrow_forwardDescribe how functional dependencies may be used to show: • There is a many-to-one connection set between the entity sets student and instructor, as well as a one-to-one relationship set between the two.arrow_forwardWhat is the cardinality for the entity Department in the following ERD? Employee Department Employee number First name Last name Job title Dept number Dept number works Dept name in Dept location Instruction: Use proper spelling and/or punctuation in your answer.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Computer Networking: A Top-Down Approach (7th Edi...Computer EngineeringISBN:9780133594140Author:James Kurose, Keith RossPublisher:PEARSON
Computer Organization and Design MIPS Edition, Fi...Computer EngineeringISBN:9780124077263Author:David A. Patterson, John L. HennessyPublisher:Elsevier Science
Network+ Guide to Networks (MindTap Course List)Computer EngineeringISBN:9781337569330Author:Jill West, Tamara Dean, Jean AndrewsPublisher:Cengage Learning 
Concepts of Database ManagementComputer EngineeringISBN:9781337093422Author:Joy L. Starks, Philip J. Pratt, Mary Z. LastPublisher:Cengage Learning
Prelude to ProgrammingComputer EngineeringISBN:9780133750423Author:VENIT, StewartPublisher:Pearson Education
Sc Business Data Communications and Networking, T...Computer EngineeringISBN:9781119368830Author:FITZGERALDPublisher:WILEY
Computer Networking: A Top-Down Approach (7th Edi...
Computer Engineering
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:PEARSON
Computer Organization and Design MIPS Edition, Fi...
Computer Engineering
ISBN:9780124077263
Author:David A. Patterson, John L. Hennessy
Publisher:Elsevier Science
Network+ Guide to Networks (MindTap Course List)
Computer Engineering
ISBN:9781337569330
Author:Jill West, Tamara Dean, Jean Andrews
Publisher:Cengage Learning
Concepts of Database Management
Computer Engineering
ISBN:9781337093422
Author:Joy L. Starks, Philip J. Pratt, Mary Z. Last
Publisher:Cengage Learning
Prelude to Programming
Computer Engineering
ISBN:9780133750423
Author:VENIT, Stewart
Publisher:Pearson Education
Sc Business Data Communications and Networking, T...
Computer Engineering
ISBN:9781119368830
Author:FITZGERALD
Publisher:WILEY