EBK DATABASE CONCEPTS
7th Edition
ISBN: 9780133777840
Author: AUER
Publisher: VST
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Textbook Question
Chapter 4, Problem 4.24RQ
What is an inclusive subtype relationship? Give an example other than one shown in this chapter. Draw an IE Crow’s Foot E-R diagram for your example.
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What 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.
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What does the weak entity type really 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.
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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- Write down traits in the Entity-Relationship (ER) model.arrow_forwardWhat is the definition of "weak entity type"? Does it have a secret? Can you elucidate what "attribute" means?How would sia appear on an ER chart? Please depict with a diagram.arrow_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_forward
- Draw the EER diagram keeping in mind the condtitions.arrow_forwardDraw 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_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
- Can you define the weak entity type for me? Is there a secret to it? Provide an instance Just what does it mean to specialize in attribute?Where does ia fit into an ER diagram? Provide Illustration or Diagramarrow_forwardbuild an entry relationship diagram using the data provided. example of graph included.arrow_forwardUse ER Assistant to draw your diagram. Draw a self-referencing entity type for the Employee entity type for which an employee is supervised by a maximum of one other employee and doesn’t have to be supervised by any employee at all. Conversely, an employee can supervise zero or many other employees. The attributes of the Employee entity are as follows: EmpNo (primary key), EmpName, EmpAddress.arrow_forward
- Entity Relationship Diagram and Class Diagram are two diagramming techniques sharing common ancestry. Please contrast and compare the two. What are the similarities and the differences?arrow_forwardSuppose that we wish to keep a genealogy. The information we wish to record about each person includes their name, date of birth, phone number, and degrees obtained . We also need to keep track of the mother, father, and children of each person. Draw a complete Entity-Relationship diagram. You must include all the details, sad as keys, weak entities (if any), cardinality constraints, etc. Your diagram must avoid redundancy.arrow_forwardDraw the E/R diagram. Use an arrow in the direction of any 1 in the cardinality. This has the sense of determines, for example, student determines (a unique) classroom in the dynamically changing relationship.arrow_forward
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