Database Systems: Design, Implementation, & Management
11th Edition
ISBN: 9781285196145
Author: Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel
Publisher: Cengage Learning
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Concept explainers
Question
Chapter 4, Problem 7RQ
a)
Program Plan Intro
Graphical representation of ERM (Entity Relationship Model) entity component:
Crow’s Foot entity box for “Student”
b)
Program Plan Intro
Graphical representation of ERM cardinality component:
The following table illustrates the different connectivity and participation combinations which are maintained by the Crow’s Foot notation:
Crow’s Foot cardinality notation
| Notation | Cardinality | Description |
 |
(0,N) | Zero or more instances |
 |
(1,N) | One or more instances |
 |
(1,1) | One instance |
 |
(0,1) | Zero or one instance |
c)
Program Plan Intro
Graphical representation of ERM entity component:
Crow’s Foot weak relationship symbol
d)
Program Plan Intro
Graphical representation of ERM entity component:
Crow’s Foot strong relationship symbol
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If you are reading a flat file, with minimal information regarding business rules and constraints. How can one determine the appropiate relationships between entities?
This question refers to entity relationship modeling. Logical ERDs.
Explain the relationship in the below Entity Relationship Diagram (ERD) inyour own words.Answer the following questions by referring to the below sample data.
Based on the set of 3NF relations derived in (b), draw a complete entity relationship diagram (ERD) using Chen notation. Make sure that all the entities, attributes, relationships and connectivities are included in your ERD
Chapter 4 Solutions
Database Systems: Design, Implementation, & Management
Ch. 4 - Prob. 1RQCh. 4 - What is a strong (or identifying) relationship,...Ch. 4 - Prob. 4RQCh. 4 - Suppose you are working within the framework of...Ch. 4 - Prob. 6RQCh. 4 - Prob. 7RQCh. 4 - Discuss the difference between a composite key and...Ch. 4 - What two courses of action are available to a...Ch. 4 - Prob. 11RQCh. 4 - Discuss two ways in which the 1:M relationship...
Ch. 4 - Prob. 13RQCh. 4 - Prob. 14RQCh. 4 - Briefly, but precisely, explain the difference...Ch. 4 - What are multivalued attributes, and how can they...Ch. 4 - Prob. 17RQCh. 4 - Prob. 18RQCh. 4 - What two attributes must be contained in the...Ch. 4 - Describe precisely the composition of the...Ch. 4 - Prob. 21RQCh. 4 - Prob. 1PCh. 4 - Create a complete ERD in Crows Foot notation that...Ch. 4 - Prob. 4PCh. 4 - Prob. 5PCh. 4 - Prob. 6PCh. 4 - Prob. 7PCh. 4 - Prob. 8PCh. 4 - Prob. 9C
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- Using the above table structure, create a normalized Entity-Relationship Model (ERM). Identify Primary Key(s) and Foreign Key(s) for all the entities, connectivities and/or cardinalities, and relationships between the entities. As for Chen's ERM notation and the normalization, the level should be in Third Normal Form (3NF) and above. [Note: you do notneed to show the normalization process such as the functional dependency diagram.]arrow_forwardWhich of the following criteria would make an entity a weak entity? a.) If the primary key is not derived from the parent entity in the relationship b.) If the entity can exist without the entity with which it has a relationship c.) If the primary key of a related entity contains the primary key of the parent entity d.) If the entity has a primary key that is partially derived from the parent entityarrow_forwardQ 4 Provide a simple ER diagram of a Weak Entity and a Strong Relationship. Provide a simple ER diagram of a Strong Entity and Weak Relationship. Full explain this question and text typing work only thanksarrow_forward
- You are required to draw a complete Crow's Foot ERD that includes the following entity relationship components based on the below:Identify all the entities and its attributesIdentify all possible relationshipsIdentify the connectivity for each relationshipIdentify the primary key and foreign key for each entityarrow_forwardWhat are the two requirements that an entity must meet in order to be classified as a weak entity?Give an example of a weak or susceptible entity to illustrate your point.arrow_forwardUse ER Assistant to draw your diagram. Transform the following M-N relationship into an associative entity type and two identifying 1-M relationships.arrow_forward
- Analyze the given entity relationship diagram and answer the following questions. What is the degree of “has” relationship? Identify primary key(s) Identify the category of each attribute Name the cardinalitiesarrow_forwardAnalyze the given entity relationship diagram and answer the following questions. What is the degree of “has” relationship?arrow_forward
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