Modern Database Management (12th Edition)
12th Edition
ISBN: 9780133544619
Author: Jeffrey A. Hoffer, Ramesh Venkataraman, Heikki Topi
Publisher: PEARSON
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Textbook Question
Chapter 3, Problem 3.21PAE
Refer to the employee EER diagram in Figure 3-2. Make any assumptions that you believe are necessary. Develop a sample definition for each entity type, attribute, and relationship in the diagram.
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Please draw the ER diagram. Explain how you know which one is entity, attribute, and all constraints. Explain each step of the diagram.
QI/ Draw ER diagram representing entity sets and relationship set described below, also determine the cardinality of the relationship: Entities: Employees(SSN. name, title) . Departments (D_ID. name, budget) Relationship: Work_in(since) Note: the atiributes of each entity or relationship are between the parenthesis of them.
Use the ER Diagram shown on Figure 2 to anewer questions 6 and 7:
6. According to the ER diagram on Figure 2, which of the following is true?
A) YearEnrolled is a derived attribute.
B) STUDENT entity has multiple unique attributes.
C) StudEmail is an optional attribute.
D) None of the above.
Answer:
7. According to the ER diagram on Figure 2, which of the following is true?
A) A student must attend a college but can only attend a single college.
B) Each college must have multiple students attending it.
C) NumOfStudents is a composite attribute.
D) None of the above.
Answer:
StudiD
CollD
StudName
STUDENT
Allends
COLLEGE
ColName
StudEmail
***
YearEnrolled (0)
NumOIStudents
Chapter 3 Solutions
Modern Database Management (12th Edition)
Ch. 3 - Define each of the following terms: supertype...Ch. 3 - Prob. 3.2RQCh. 3 - Contrast the following terms: supertype; subtype...Ch. 3 - State two conditions that indicate when a database...Ch. 3 - Prob. 3.5RQCh. 3 - Give an example (other than those discussed in the...Ch. 3 - What is the attribute inheritance? Why is it...Ch. 3 - Give an example of each of the following: a...Ch. 3 - What types of business rules are normally captured...Ch. 3 - What is the purpose of a subtype discriminator?
Ch. 3 - Prob. 3.11RQCh. 3 - In what ways is starting a data modeling project...Ch. 3 - Prob. 3.13RQCh. 3 - Prob. 3.14RQCh. 3 - What do you purchase when you acquire a packaged...Ch. 3 - Prob. 3.16RQCh. 3 - When is a member of a supertype always a member of...Ch. 3 - Examine the hierarchy for the university EER...Ch. 3 - Add a subtype discriminator for each of the...Ch. 3 - For simplicity, subtype discriminators were left...Ch. 3 - Refer to the employee EER diagram in Figure 3-2....Ch. 3 - Refer to the EER diagram for patients in Figure...Ch. 3 - Figure 3-13 shows the development Of entity...Ch. 3 - Refer to Problem and Exercise 2-44 in Chapter 2...Ch. 3 - For a library, the entity type HOLDING has four...Ch. 3 - A bank has three types of accounts: checking,...Ch. 3 - Refer to your answer to Problem and Exercise 2-4...Ch. 3 - Refer to your answer to Problem and Exercise 3-24...Ch. 3 - Prob. 3.29PAECh. 3 - Prob. 3.30PAECh. 3 - Develop an EER model for the following situation,...Ch. 3 - Draw an EER diagram for the following description...Ch. 3 - Prob. 3.33PAECh. 3 - Prob. 3.34PAECh. 3 - Based on the EER diagram constructed for Problem...Ch. 3 - Prob. 3.36PAECh. 3 - Prob. 3.37PAECh. 3 - Add the following to Figure 3-16: An EMPLOYMENT...
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- QI/ Draw ER diagram representing entity sets and relationship set described below, also determine the cardinality of the relationship: Entities: Employees(SSN, name, title), Departments (D_ID, name, budget) Relationship: Work_in(since) Note: the attributes of each entity or relationship are between the parenthesis of them.arrow_forwardCreation of Entity Relationship Diagram Draw the entity relationship diagram (ERD) for this information.arrow_forwardDesign the Entity Relationship Diagram (ERD) showing entities, attributes, primary key and relationship cardinality for the following scenario. Any employee works for only a department and under supervision of a manager (where manager is also an employee). Employee's address, city code & city name also has been recorded. Every employee may work for multiple project, but an employee may be on vacation and not assigned to any projects. Working hour may be different for an employee for different projects. Projects are broken into tasks; A task is created for one project and assigned to one department. Requisitions are made for projects; Each requisition could ask for any number of items; Items could be: equipment item or materials item and are coded in a similar way; Each requisition is for one project and is made to one supplier. The important data fields are employee_id, employee_name ,employee_address, employee_email, department_id, department_name, location, city_code, city_name,…arrow_forward
- Draw an Entity Relationship Diagram for ther following information.arrow_forwardScenario – “Generate ERD of Use Case Diagram” Task to do: i. Identify Entities with atleast 10 attributes per Entities.ii. Identify all relationship from the given Scenarioiii. Generate Entity Relationship Diagramarrow_forwardModify the Er diagram given below and add 5 to 6 more additions to it such as entities attributes relationships etcarrow_forward
- The entity type STUDENT has the following attributes: Student Name, Address, Phone, Age, Activity, and No of Years. Activity represents some campus-based student activity, and No of Years represents the number of years the student has engaged in this activity. A given student may engage in more than one activity. Draw an ERD for this situation. What attribute or attributes did you designate as the identifier for the STUDENT entity? Why?arrow_forwardAnalyze the given entity relationship diagram and answer the following questions. What is the degree of “has” relationship?arrow_forwardEntity Relationship Diagram of the business, as shown in the case. Completely and correctly specify all Entities, Relationships and Attributes Order: has one or many items; half by member half by anonymous member (no member number)Has: order number, each order item has total cost (with and without gst), number of store, cashier who took the order, member number (if provided), date on which the order was places, and, if the order is not picked up in-person, the date on which the order is shipped. Order-Item (one of the 1600 products):to identify: useorder number as well as a small “item sequence number” (which is unique within each order). product number, quantity ordered and the actial "unit price paid" If a valid member number is on the order, the system should use the product’s special “member price”, otherwise the product’s “regular price” is used. The average order includes 11 distinct order-items. Member (places 5 orders per month on avg):last name, given names, email…arrow_forward
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Enhanced Entity Relationship Model; Author: Data Science Center;https://www.youtube.com/watch?v=ocQUtXPumdQ;License: Standard YouTube License, CC-BY