Database Systems: Design, Implementation, & Management
13th Edition
ISBN: 9781337627900
Author: Carlos Coronel, Steven Morris
Publisher: Cengage Learning
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Chapter 4, Problem 1P
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ER Diagram:
The following figure illustrates the Entity Relationship Diagram (ERD) for given business rules in Crow’s Foot notation:
Explanation:
- The “ASSIGNMENT” entity is optional for the “PROJECT”, because it allows a user to create a new project without creating a new assignment...
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Use the following business rules to create a Crow’s Foot ERD. Write all appropriate connectivities and cardinalities in the ERD. a. A department employs many employees, but each employee is employed by one department. b. Some employees, known as “rovers,” are not assigned to any department. c. A division operates many departments, but each department is operated by one division. d. An employee may be assigned many projects, and a project may have many employees assigned to it. e. A project must have at least one employee assigned to it. f. One of the employees manages each department, and each department is managed by only one employee. g. One of the employees runs each division, and each division is run by only one employee. Given these data requirements, design a logical/relational data model for this company. Use Microsoft Visio for your diagrams. You can add substantial detail to your data model by including sample attributes for each of the entities. Specify primary and foreign…
Use the following business rules to create a Crow’s Foot ERD. Present all appropriate connectivities and cardinalities in the ERD.
A department employs many employees, but each employee is employed by one department.
Some employees are not assigned to any department.
A division operates many departments, but each department is operated by one division.
An employee may be assigned many projects, and a project may have many employees assigned to it.
Draw an ERD for each of the following situations. (If you believe that you need to make additional assumptions, clearly state them for each situation.) Use MS Visio to draw the models.
2. A laboratory has several chemists who work on one or more projects. Chemists also may use certain chemicals on each project. Attributes of CHEMIST include Employee ID (identifier), Name, and Phone No. Attributes of PROJECT include Project ID (identifier) and Start Date. Attributes of CHEMICAL include Compound No and Cost. The organization wishes to record Volume Used—that is, the amount of a given chemical used by a particular chemist working on a specified project. A chemist must be assigned to at least one project and one chemical on each project to which he or she is assigned. A given chemical need not be assigned to any project, and a given project need not be assigned to either a chemist or a chemical. Provide good definitions for all of the relationships in this situation.
Please give proper…
Chapter 4 Solutions
Database Systems: Design, Implementation, & Management
Ch. 4 - Prob. 1RQCh. 4 - What is a strong (or identifying) relationship,...Ch. 4 - Prob. 4RQCh. 4 - Suppose you are working within the framework of...Ch. 4 - Prob. 6RQCh. 4 - Prob. 7RQCh. 4 - Discuss the difference between a composite key and...Ch. 4 - What two courses of action are available to a...Ch. 4 - What is a derived attribute? Give an example. What...Ch. 4 - Prob. 11RQ
Ch. 4 - Discuss two ways in which the 1:M relationship...Ch. 4 - Prob. 13RQCh. 4 - Prob. 14RQCh. 4 - Briefly, but precisely, explain the difference...Ch. 4 - What are multivalued attributes, and how can they...Ch. 4 - Prob. 17RQCh. 4 - Prob. 18RQCh. 4 - What two attributes must be contained in the...Ch. 4 - Describe precisely the composition of the...Ch. 4 - Prob. 21RQCh. 4 - Prob. 1PCh. 4 - Create a complete ERD in Crows Foot notation that...Ch. 4 - Prob. 4PCh. 4 - Prob. 5PCh. 4 - Prob. 6PCh. 4 - Prob. 7PCh. 4 - Prob. 8PCh. 4 - Prob. 9PCh. 4 - Prob. 10PCh. 4 - Prob. 11C
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- Use the following business rules to create a Crow’s Foot Entity Relationship Diagram. Write all appropriate connectivities and cardinalities in the ERD. Add other linking entities as needed. • A department employs many employees, but each employee is employed by one department. • Some employees, known as “rovers,” are not assigned to any department. • A division operates many departments, but each department is operated by one division. • An employee may be assigned many projects, and a project may have many employees assigned to it. • 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_forwardDraw 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_forwardCreate an ER/EER diagram for the following 1. Professors have an SSN, a name, an age, a rank, and a research specialty. Projects have a project number, a sponsor name (e.g., NSF), a starting date, anending date, and a budget. Graduate students have an SSN, a name, an age, and a degree program (e.g., M.S.or Ph.D.). Each project is managed by one professor (known as the project’s principalinvestigator). Each project is worked on by one or more professors (known as the project’s co-investigators). Professors can manage and/or work on multiple projects. Each project is worked on by one or more graduate students (known as the project’sresearch assistants). When graduate students work on a project, a professor must supervise their work on the project. Graduate students can work on multiple projects, in which case they will have a (potentially different) supervisor for each one. Departments have a department number, a department name, and a main office. Departments have a professor (known…arrow_forward
- Q2: Draw an E-R diagram Representing the relationship between Employee with Attribute EmpID, Name, Address And Project with Attributes proj-id and proj-Name. Each employee may be assigned one or more projects, or may not be assigned any project on the other hand one or more projects, may be assigned to an employee.arrow_forwardDraw an ERD for the following problem:Company organized into departments. Each department has unique, name and a particular employee who manages the department. Start date for the manager is recorded. Department may have several locations. A department controls a number of projects. Projects have a unique name, number and a single location. Company’s employees name, ssno, address, salary, sex and birth date are recorded. An employee is assigned to one department, but may work for several projects (not necessarily controlled by her dept). Number of hours/week an employee works on each project is recorded; the immediate Supervisor for the employee. Employee’s dependents are tracked for health insurance purposes (dependent name, birthdate, relationship to employee).arrow_forwardIt is requested to draw an entity relationship diagram (ERD) for a hospital management system.Information about the subject are given below.• The patients contain ID, name, and surname. Doctors have name, surname, and department.Rooms have number and capacity.• Each doctor may supervise zero or more patients.• Each patient should be supervised by one doctor.• Each room may host zero or more patients.• Each patient should be hosted in one room.arrow_forward
- Create an Entity Relationship Diagram using the following scenario: A restaurant chain has several store locations in a city (with a name and postal code stored for each), and each is managed by one manager. Managers manage only one store. Each restaurant location has its own unique set of menus. Most have more than one menu (e.g., lunch and dinner menus). Each menu has many menu items, and items can appear on multiple menus, and with different prices on different menus.arrow_forwardGiven the following conceptual representation: Based on the participation of Department and Employee in manages, what can you conclude?c) Based on the cardinality of works, what can you conclude? Explain the corresponding business ruled) Mention one alternate key for Projecte) What is supervises in this diagram? Provide as many details as possible f) Convert the E-R diagram into tables. You can draw tables or provide the Relational Schema g) What do you need to modify to specify that every employee must have a supervisor? Details matter h) How would you include suppliers in this diagram? Provide a clear explanation and illustrate your answer with an extract of your original E-R diagramarrow_forwardDraw ERD for each of the following situations. Clearly state any additional assumption(s) for each of the situation:AIT Inc with Prof. Dzidonu as the President has a number of employees. The attributes of the EMPLOYEE include Employee_ID (identifier), Name, Address and Birthdate. The company has also several projects. Attributes of PROJECT include Project_ID, (Identifier), Project_Name and Start_Date. Each Employee may be assigned to one or more projects or may not be assigned to a project.A project must have at least one employee assigned and may have any number of employees assigned. An employee’s billing rate may vary by project, and the company wishes to record the applicable billing rate (Billing_Rate) for each employee when assigned to a particular project. Do the attribute names in this description follow the guidelines for naming attributes? If not, suggest better namesarrow_forward
- GYM MANAGEMENT SYSTEM. The following is the project scope of gym management system for STARS GYM FITNESS CENTRE. · Maintain client records, accounts, packages, contract, body types · Match coach · Manage transaction(receive payment i.e. two kind of payment) · Report: contract per period, top 8 packages. Use the project scope to answer the question below. 1. Draw a use case-case diagram(must include association relationship and at least one <<depends on>> relationship) · Use-cases · Actors · Associations · At least one<<depends on>> relationship · Frame and system name.arrow_forwardEntity-Relationship Diagrams (ERD) Background Information: Study the following statements to determine the relationship between the entities • Each student has an academic advisor. An academic advisor can advise many students. • Each academic advisor has a specific parking spot assigned. • Each student can take up to five courses. and each course has up to 24 students. • Several adjunct faculty members share an office. Tasks: 1. Draw an ERD (it is just one diagram) showing the entities and the relationships among them. Include associative entities, if any. Also, remember to show cardinality (1:1, 1:M, M:N); you can use the cardinality notation or the crow’s foot notation. Remember that this is a graphical language, and you must follow the shapes of the elements in the diagram.arrow_forwardExplanation In the first example, your initial amount of money is $200, which enable you to invest in the first, second, fourth and fifth project that needs only $200 each. By establishing these four projects apart, the investor will have $200*4 (profit) +$200 (initial basic) = $1000. This amount of money will enable the establishment the 3rd project that needs $500 of investment to gain $200 of profit. Finally, to calculate the overall profit, you have collected $1200, where $200 of them are the initial basic and hence the profit is $1200 - $200 = $1000. In the second example, your initial amount of money is $150, which enable you to invest in the 3rd project only. By doing so, your budget will increases to $200 and hence be able to invest in the 1st project to again increase your budget to $290. However, this is not enough to invest in the 3rd project. Finally, you collected $290, where $150 of them are the initial basic and hence the profit is $290 - $150 = $140. """ I want…arrow_forward
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