When mapping generalisations and specialisations in enhanced entity relationship diagrams, which solution will deliver the least redundancy and allow representation of the most specialisation types. Select one: a. Multiple relations representing subclass entities only. b. A single relation containing a type attribute. c. Multiple relations representing both superclass and subclass entities. d. A single relation with multiple boolean type attributes

When mapping generalisations and specialisations in enhanced entity relationship diagrams, which solution will deliver the least redundancy and allow representation of the most specialisation types. Select one: a. Multiple relations representing subclass entities only. b. A single relation containing a type attribute. c. Multiple relations representing both superclass and subclass entities. d. A single relation with multiple boolean type attributes

Principles of Information Systems (MindTap Course List)

12th Edition

ISBN:9781285867168

Author:Ralph Stair, George Reynolds

Publisher:Ralph Stair, George Reynolds

Chapter5: Database Systems And Applications

Section5.7: Information Systems @ Work: Brandwatch: Applying Business Intelligence To Social Media Data To Make Advertising Decisions

Problem 1CTQ

See similar textbooks

Similar questions

Data modelling is most often accomplished through the use of a(an) ________________. a. entity-relationship diagram b. data-flow diagram c. functional decomposition diagram d. activity diagram
Distinguish between the ways in which functional dependencies may be utilized to express the following: • Between the entity sets student and teacher, there is a one-to-one relationship set that exists.• There is a many-to-one connection set between the entity setsstudent and teacher, which is defined as
Describe how functional dependencies may be used to denote the following:• The entity sets student and teacher have a one-to-one relationship set.• There is a many-to-one connection set between the entity sets student and teacher.
Can foreign keys be used with weak entities in an entity relationship diagram??
Describe how functional dependencies may be used to show: • There is a many-to-one connection set between the entity sets student and instructor, as well as a one-to-one relationship set between the two.
Just 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.
Discuss how traceability relations are classified, elicit a brief example that defines the classification context, and draw a diagram if necessary.
how to graphically identify an entity, a the cardinality (o,N), a weak relation ship, and a strong relationship in a Crow's Foot ntation?
Draw an ER diagram of ONLINE COURSE REGISRATION database, that captures all the given below requirements. Specify key attribute(s) of each entity set. For each relationship set, specify structural constraints and participation constraints
Analyze the given entity relationship diagram and answer the following questions. What is the degree of “has” relationship?
When working with database entity relationship modeling, should the cardinality between entities be translated/ read from both ends of the notation? In other words, should a relationship between entities have the ability to understood if read forwards and backwards?
What exactly is the weak entity type? What is the key to it? Give an example what is an altrubute specialization?how ia represent on ER diagram? Give Example and draw corresponding diagram