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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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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2. The following state transition table is a simplified model of process management,
with the labels representing transitions between states of READY, RUN,
BLOCKED, and NONRESIDENT.
READY
RUN
BLOCKED
NONRESIDENT
READY
RUN
-
1
-
5
BLOCKED
2
4
3
-
6
Give an example of an event that can cause each of the above transitions. Draw a
diagram if that helps. (5)
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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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