DATABASE SYSTEM CONCEPTS (LOOSELEAF)
7th Edition
ISBN: 9781260515046
Author: SILBERSCHATZ
Publisher: MCG
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Chapter 6, Problem 25E
Explanation of Solution
Representations of a ternary relationship by binary relationships:
- A ternary relationship consists of 3 entity sets that takes part in a relationship.
- A ternary relationship shown in Figure 6.29(a) can be represented as three binary relationship as shown in Figure 6.29(b) or as an alternative in Figure 6.29(c).
- The model of Figure 6.29(c) will not be able to represent all ternary.
- The model given in Figure 6.29(b) is an ideal conversion of a ternary relationship into three binary ones.
- But the model given in Figure 6.29(c) will not be able to represent all ternary relationships...
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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 6 Solutions
DATABASE SYSTEM CONCEPTS (LOOSELEAF)
Ch. 6 - Prob. 1PECh. 6 -
Consider a database that includes the entity sets...Ch. 6 -
Design an E-R diagram for keeping track of the...Ch. 6 - Prob. 4PECh. 6 - Prob. 5PECh. 6 - Prob. 6PECh. 6 - Prob. 7PECh. 6 -
Consider a relation such as sec_course, generated...Ch. 6 -
Suppose the advisor relationship set were...Ch. 6 - Prob. 10PE
Ch. 6 - Prob. 11PECh. 6 - Prob. 12PECh. 6 - Prob. 13PECh. 6 - Prob. 14ECh. 6 - Prob. 15ECh. 6 - Prob. 16ECh. 6 - Prob. 17ECh. 6 -
Consider two entity sets A and B that both have...Ch. 6 - Prob. 19ECh. 6 - Prob. 20ECh. 6 - Prob. 21ECh. 6 - Prob. 22ECh. 6 - Prob. 23ECh. 6 -
Design a database for an airline. The database...Ch. 6 - Prob. 25ECh. 6 -
Design a generalization – specialization...Ch. 6 -
Explain the distinction between disjoint and...Ch. 6 -
Explain the distinction between total and partial...
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