EBK DATABASE CONCEPTS
7th Edition
ISBN: 9780133777840
Author: AUER
Publisher: VST
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Textbook Question
Chapter 4, Problem 4.7RQ
Define the term entity, and give an example other than those used in this book.
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What does it mean to be a weak entity? Give an illustration.
Explain the ambiguity in the definition of the term weak entity. Explain how this book interprets this term
Explain entity sets.
Chapter 4 Solutions
EBK DATABASE CONCEPTS
Ch. 4 - Prob. 4.1RQCh. 4 - Prob. 4.2RQCh. 4 - Prob. 4.3RQCh. 4 - What is a use case, and what is its purpose?Ch. 4 - Give an example of a data constraint.Ch. 4 - Prob. 4.6RQCh. 4 - Define the term entity, and give an example other...Ch. 4 - Explain the difference between an entity class and...Ch. 4 - Define the term attribute, and give examples for...Ch. 4 - Define the term identifier, and indicate which...
Ch. 4 - Prob. 4.11RQCh. 4 - Prob. 4.12RQCh. 4 - Prob. 4.13RQCh. 4 - Prob. 4.14RQCh. 4 - List and give an example of the three types of...Ch. 4 - Prob. 4.16RQCh. 4 - Prob. 4.17RQCh. 4 - Prob. 4.18RQCh. 4 - Define the term weak entity, and give an example...Ch. 4 - Explain the ambiguity in the definition of the...Ch. 4 - Define the term associative entity, and give an...Ch. 4 - Define the terms supertype, subtype, and...Ch. 4 - What is an exclusive subtype relationship? Give an...Ch. 4 - What is an inclusive subtype relationship? Give an...Ch. 4 - Prob. 4.25RQCh. 4 - Prob. 4.26RQCh. 4 - Prob. 4.27RQCh. 4 - Prob. 4.28RQ
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- Define Key Attribute with an example.arrow_forwardFor each of the following pairs of related entities, indicate whether (under typical circumstances) there is a one-tomany or a many-to-many relationship. Then, using the shorthand notation introduced in the text, draw a diagram for each of the relationships.a. STUDENT and COURSE (students register for courses)b. BOOK and BOOK COPY (books have copies)c. COURSE and SECTION (courses have sections)d. SECTION and ROOM (sections are scheduled in rooms)e. INSTRUCTOR and COURSEarrow_forwardEntity, relationship, and attribute names and definitions should all be correct.arrow_forward
- Please help with the following: What concept is defined by the following definition? ”A set of entities of the same type that share the same properties and attributes.” Select one: a. All of the above b. Relation c. Entity set d. Relationship setarrow_forwardPlease answer.arrow_forwardGive some specific guidelines for defining attributes?arrow_forward
- Please provide a definition of an entity-relationship model as well as an explanation of how it works.arrow_forwardPlease hand draw the ER diagram with all attributes and entities not this chatgot generated one.arrow_forwardFor each of the below relationships, provide an explanation of what it is and a relevant example.One-to-many relationship. Many-to-many relationship. One-to-one relationship.arrow_forward
- Give an example of each of the following, other than those described in this chapter, and clearly explain why your example is this type of relationship and not of some other degree.a. ternary relationshipb. unary relationshiparrow_forwardUsing the relations ATTACHED, normalize your relations into first, second, and third normal forms. First, KINDLY describe the changes required to your relations to meet the standard of the first 1NF and then 2NF and lastly 3NF. Then, you should provide an Entity Relationship diagram that is in 3NF. All attributes, entities, keys, and relationships should be included and labelled. Hint: Remember that in the hospital software system, the “Patient” relation includes the “medicines” attribute and the “Appointment” relation includes the “allergies” attribute. Allergies describe a list of any known allergies and medicines describe a list of medicines prescribed for a patient. Please add: Define or describe the changes required to get the relations into the 1st normal form. Define or describe the changes required to get the relations into the 2nd normal form. Include an Entity Relationship diagram in the 3rd normal form. The primary and foreign keys, at a minimum, are defined for each…arrow_forwardWhat does the term "relationship" mean? What are the qualities of a relation defined as?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