Modern Database Management
13th Edition
ISBN: 9780134773650
Author: Hoffer
Publisher: PEARSON
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Textbook Question
Chapter 2, Problem 2.25PAE
Answer the following questions concerning Figure 2-22:
- Where is a unary relationship, what does it mean, and for what reasons might the cardinalities on it be different in other organizations?
- Why is Includes a one-to-many relationship, and why might this ever be different in some other organization?
- Does Includes allow for a product to be represented in the
database before it is assigned to a product line (e.g., while the product is in research and development)? - If there is a rating of the competency for each skill an employee possesses, where in the data model would we place this rating?
- What is the meaning of the DOES BUSINESS IN associative entity, and why does each DOES BUSINESS IN instance have to be associated with exactly one TERRITORY and one CUSTOMER?
- In what way might Pine Valley change the way it does business that would cause the Supplies associative entity to be eliminated and the relationships around it to change?
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Please read this carefully and Draw an EER diagram for a database of a hospital following these requirements:
create Four to five regular strong entities. A union One 1:1, one 1:N, and one N:M relationship – of which at least one relationship should be partial and one full. One overlap relationship and one disjoint relationship. Other notes: Do not emphasize on too many attributes for the entities. Two to three attributes for each entity will be enough. Make sure to include a primary key for each entity.
Note: The previous 4 questions were related. I don't know if no. 5 is related or not. I have provided other previous questions too.
Question 1:
Create the Entity Relationship (ER) Diagram for the following scenario.
We want to maintain a database for a Faculty within a multi-campus regional university. The faculty has a number of schools and each school is characterized by its school-code which is unique, name and campus location. Schools employ professors who are characterized by their unique staff-id, name and the school they work for. A school offers courses that are characterized by their course-code which is unique, course name and the school. There are subjects offered within the faculty and these arecharacterized by unique subject-code, title and the school that offers them. Students enroll into courses that are characterized by student-id which is unique, name, address and phone.The following business rules apply• A course must belong to only one school, but a school may have…
Produce an entity relationship diagram for a relational database that will be able to address the case study. It is your task to design a database that will adhere to good design principles.
Chapter 2 Solutions
Modern Database Management
Ch. 2 - Define each of the following terms: entity type...Ch. 2 - Match the following terms and definitions....Ch. 2 - Contrast the following terms: stored attribute;...Ch. 2 - Prob. 2.4RQCh. 2 - Prob. 2.5RQCh. 2 - Prob. 2.6RQCh. 2 - State six general guidelines for naming data...Ch. 2 - Prob. 2.8RQCh. 2 - Prob. 2.9RQCh. 2 - State three conditions that suggest the designer...
Ch. 2 - List the four types of cardinality constraints,...Ch. 2 - Give an example, Other than those described in...Ch. 2 - What is the degree of a relationship? List the...Ch. 2 - Give an example (Other than those described in...Ch. 2 - Give an example of each of the following, other...Ch. 2 - Give an example of the use of effective (or...Ch. 2 - State a rule that says when to extract an...Ch. 2 - Prob. 2.18RQCh. 2 - In addition to explaining what action is being...Ch. 2 - For the Manages relationship in Figure 2-12a,...Ch. 2 - Explain the distinction between entity type and...Ch. 2 - Why is it recommended that every ternary...Ch. 2 - A cellular operator needs a database to keep track...Ch. 2 - Prob. 2.24PAECh. 2 - Answer the following questions concerning Figure...Ch. 2 - Prob. 2.26PAECh. 2 - You may have been assigned a CASE or a drawing...Ch. 2 - Consider the two E-R diagrams in Figure 2-25 Q,...Ch. 2 - Prob. 2.29PAECh. 2 - Are associative entities also weak entities? Why...Ch. 2 - Because Visio does not explicitly show associative...Ch. 2 - Figure 2-26 shows a grade report that is mailed to...Ch. 2 - Prob. 2.33PAECh. 2 - The Is Married To relationship in Figure 2-12a...Ch. 2 - Figure 2-27 represents a situation of students who...Ch. 2 - Figure 2-28 shows two diagrams (A and B), both of...Ch. 2 - Prob. 2.37PAECh. 2 - Review Figure 2-8LQ and Figure 2-22. Identify any...Ch. 2 - Prob. 2.39PAECh. 2 - Prob. 2.40PAECh. 2 - Prob. 2.41PAECh. 2 - Prob. 2.42PAECh. 2 - Prob. 2.43PAECh. 2 - Prob. 2.44PAECh. 2 - Prob. 2.45PAECh. 2 - Prob. 2.46PAECh. 2 - Prob. 2.47PAECh. 2 - Prob. 2.48PAECh. 2 - Draw an ERD for the following situation. (State...Ch. 2 - Prob. 2.50PAECh. 2 - Prob. 2.51PAECh. 2 - Review your answer to Problem and Exercise 2-49 if...
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- The ______________ model is a simple but highly useful way to organize data into collections of two-dimensional tables called relations.arrow_forwardA new sales ordering system needs a relational database that contains a customer table, a product inventory table, and an order table. Use a word-processing, graphics, or spread-sheet program to draw an entity-relationship diagram showing the relationships among these entities. Next, design each of these tables showing the keys and attributes to be included in each table. Include five sample records for each table.arrow_forwardModify the Er diagram given below and add 5 to 6 more additions to it such as entities attributes relationships etcarrow_forward
- Design an entity–relationship diagram for this database. Identify primary keys and relationship cardinalities using(min:max)notation. If you make any assumptions, please state them clearly.arrow_forwardDesign a database for a worldwide package delivery company (e.g., DHL or FedEx). The database must be able to keep track of customers who ship items and customers who receive items; some customers may do both. Each package must be identifiable and trackable, so the database must be able to store the location of the package and its history of locations. Locations include trucks, planes, airports, and warehouses. Your design should include an E-R diagram, a set of relational schemas, and a list of constraints, including primary-key and foreign-key constraints.arrow_forwardDraw the ER diagram based on the following specification. A tutorial school is using a database to manage information about teachers, courses, and students. Each teacher is identified by staff_id, has a name, an email address, and a phone number. Each student is identified by student_id, has a name, an email address, and a registration date. Each course is identified by course_id, year, and semester. In addition, each course has a name. Each course is associated with multiple lessons. A lesson has a lesson number, a location, a date, a start-time, and an end-time. Lesson numbers are sequentially numbers, starting from 1, generated separately for each course. Each teacher teaches at least one course. Each student takes at least one course. Each course is taught by one teacher. Each course can be taken by many students.arrow_forward
- Design a database for an airline. The database must keep track of customers and theirreservations, flights and their status, seat assignments on individual flights, and the scheduleand routing of future flights. Your design should include an E-R diagram, a set of relationalschemas, and a list of constraints, including primary-key and foreign-key constraints.arrow_forwardDraw an Entity Relationship Diagram of Store Management System(Retail Store Database). Properly mention the entities, identify the relationships and find the cardinality of each relation very carefully. At this point of time your ERD should be final and not any major changes should occur. Properly mention following: a. Entity b. Relationship c. Attributes d. Cardinality iF HAND WRITTEN THE DIAGRAM SHOULD BE NEAT DO NOT POST COPIED DIAGRAMarrow_forward1. To create the ERD for the SIM system, the Entity - Relationship Diagram, which helps to describe the database for a computer system, go back to the information system DFD you created for Assignment 4 and just label the data flow arrows using the cardinality notation. That will show the relationship between the entities on your ERD. 2. To design sample data tables from the ERD you created in #1, you need to think of the objects that will be part each process. These objects will become the column headers for your table. So for example, the Customers table will have fields like name and address, and their household should have an ID #. Do this for all the objects in your ERD. Carlie asked that the database be a 3NF or Third Normal Form, all that means is that you will have a simple, one field, primary key for each of your data tables. No data repeats in any table and all of the fields in a table are dependent on its primary key. So you should create 6 data tables, one for each of the…arrow_forward
- Subject: DatabaseIdentify ALL errors and correction on the entity relationship diagram (ERD) given in Figure 5.i. Circle the errors identified on the diagram.ii. For each error identified, correct them. Show your corrections either by redrawing the corrected diagram OR by describing how the errors should be corrected next to the circles that you have identified.arrow_forwardCan you please help me in how I can turn the Entity Relationship diagram into a Logical Database Diagram? I know I need to list out all the entities, but I am not sure how to draw the relation. If you would please write it step by step for me so I can practice, that would be much appreciated.arrow_forwardShould the cardinality between entities be translated/read from both ends of the notation when dealing with database entity relationship modelling? In other words, should a relationship between things be understandable when read both forwards and backwards?arrow_forward
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