EBK DATABASE CONCEPTS
7th Edition
ISBN: 9780133777840
Author: AUER
Publisher: VST
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Chapter 4, Problem 4.18RQ
Explanation of Solution
ID-dependent entity:
In the entity-relationship model, an identifier of one entity is dependent on the identifier of another entity and it is special kind of weak entity.
In entity-relationship model, id-dependent entity is represented as rounded corners.
Note: Identifier is an attribute which is used to uniquely identify a particular entity instances from an entity.
Example:
The example demonstrates one-to-many (optional) relationship between “STUDENT” and “ADDRESS” entity.
IE Crow’s Foot E-R diagram:
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Define the term ID-dependent entity, and give an example other than one used in this text. Draw an IE Crow’s Foot E-R diagram for your example.
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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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- The distinction between a weak and a strong entity set is best explained here.arrow_forwardGive an example of how the distinction between a candidate key and an entity type identifier is made.arrow_forwardJust what does "weak entity type" mean? Is there a secret to it? Can you explain the meaning of "attribute"?How does sia look like on an ER chart? Please illustrate with a diagram.arrow_forward
- Explain ENTITY EXTRACTION AND ER DIAGRAMarrow_forwardEntity-relationship diagrams have a specific function, which is explained below. And what kind of symbol is utilised to represent a relationship, and how does it function? In what way does the word "associative entity" convey that something is happening and what does it mean? Could you provide an example?arrow_forwardWhat exactly does it imply when we talk about the weak entity type? What exactly is the key? Please provide an example. What exactly is meant by the term "alternative specialisation"?Where exactly do I fit into the ER diagram? Provide an illustration, then draw a diagram that corresponds to it.arrow_forward
- Draw an ER diagram for the following scenario- • An instructor has an ID, a name, and a phone number. An instructor teaches a course • A course has a code, course name, credits, and an instructor. Each course uses a textbook. • A textbook has ISBN, name, publisher, editor, and authors. Your ER diagram should have entities, attributes, composite attribute, multivalued attribute, key attributes, binary relationships, and a total participation. Explain your rationale behind each design choice. Please draw the ER diagram on paper showing all seperate parts for each instructor, course and textbook. Showing each connection seperately and explaining which connection is whicharrow_forwardOO questions Create the UML diagram for the two entities( person, books). A person has borrowed some books from a library. This can be represented as one to many associations. Please implant this bidirectional association considering that there is no order of the books.arrow_forwardAttributes from the identifying entity set's main key may be added to a weak entity set to make it strong. Please describe the overlap that will develop as a result of our choice.arrow_forward
- "Weak entity type" means what? Does it hide something? What's "attribute"?How would an ER chart show sia? Please draw.arrow_forwardWhat is the purpose of entity-relationship diagrams? What sort of symbol is used to depict a connection, and how does it work? What exactly does the phrase "associative entity" imply and what does it mean? Give an example.arrow_forwardWhat does the weak entity type actually mean? What's the secret? Give an instance What does alternative specialization mean?How am I shown on the ER diagram? Give an example and create a diagram to match it.arrow_forward
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