Modern Database Management
13th Edition
ISBN: 9780134792293
Author: Hoffer
Publisher: PEARSON
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Textbook Question
Chapter 2, Problem 2.31PAE
Because Visio does not explicitly show associative entities, it is not clear in Figure 2-22 which entity types are associative. List the associative entities in this figure. Why are there so many associative entities in Figure 2-22?
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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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.Similar questions
- The distinction between a weak and a strong entity set is best explained here.arrow_forwardCreate an Entity-Relationship Model to represent the data requirements of the problem given below. Specify the cardinalities of relationships and all-important constraints. Also mention the assumptions if you have made any. A Medical store has many branches throughout country. The data held on each branch is the branch address made up of street, city, and zip code, and telephone number. Each branch is given a branch number, which is unique throughout the country. Each branch is allocated at least one staff member. Each staff member must belong to exactly one branch. The data held on a member of staff is his or her name, position and salary. Each member of staff is given a staff number, which is unique throughout the country. Each branch has a one or many products. A product belongs to exactly one or many branches. The data held on a product is the product number (identifier), title, category, price, and available quantity. Each product is purchased from exactly one vendor. From one…arrow_forwardSpecifically, on which side of a many-to-one connection does the primary key of one entity function as a foreign key? There is a huge number of relationships specified on one side of the diagram. both from the inside and the outside It is possible to define two relationships at the same time. On the one hand, one connection is defined; on the other, another relationship is defined.arrow_forward
- b. Draw an Entity Relationship diagram from each of the following descriptions. Include the attributes, primary keys (underlines) and the relationships in the diagram (like relationship in Access). i. Each of the department has many employees assigned to it, but each employee works for only one department. if. A customer can rent many videotapes from the video store. Each of the videotapes can be rented to many customers.arrow_forwardExplain how functional dependencies can be used to indicate the following: A one-to-one relationship set exists between entity sets student and Instructor. A many-to-one relationship set exists between entity sets student and instructor.arrow_forwardGive Some additional examples of strong and weak entity pairs?arrow_forward
- Explain how weak entity representation differs from strong entity representation.arrow_forwardIn what way is it different between a weak entity and a strong entity that must have a connection with another entity?arrow_forwardTo manage the materials of a factory, please give the E-R diagrams. Such entity sets are involved as below: Warehouse: with attributes as Number, area and telephone Accessory : with attributes as number, Name, Specification, price and description Supplier: with attributes as Number, name, address, telephone and асcount Project : with attributes as number and budget Employee : with attributes as number, name and agearrow_forward
- What 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_forwardTurn the following ER Diagram into a collection of relation schemas. Identify as many of the constraints as possible. Note: Courses is a weak entity set, and Number is a discriminator because it can be used to differentiate different courses once the department Code is given. Courses Depts Number: int. Title: varchar(30) Credit: int Code: char(4) Name: varchar(20) Budget: int GivenBy TaughtBy Instructors WorksIn ID: int FName: varchar(20) LName: varchar(20)arrow_forwardApplying your knowledge in Enhanced Entity Relationship modeling, Develop an EER model for the following situation: A person may be employed by one or more organizations and each organization may be the employer of one or more persons. An organization can be internal organizational unit or an external organization. For persons and organizations, we want to know their ID, name, address and phone number. For persons we want to know their birthdate, and for organizations, we want to know their budget number. For each 6 employment, we want to know the employment date, termination date and bonus. Employment of a person by an organization may result in the person holding many positions over time. For each position, we know its title, and each time someone holds that position, we need to know the start date and termination date and salary. An organization is responsible for each position. It is possible for a person to be employed by one organization and hold a position for which another…arrow_forward
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