EBK DATABASE CONCEPTS
7th Edition
ISBN: 9780133777840
Author: AUER
Publisher: VST
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Chapter 5, Problem 5.28RQ
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Supertype entity:
- In DBMS (
Database Management System), the supertype is the one of the entity type and it has a relationship with one or more subtypes. - The supertype contains attributes that are common to its subtypes.
Subtype entity:
- Subtype contains unique attributes, but it is different from each subtype.
- The subtype entities are subgroups of the supertype entity.
Example:
Consider an example of supertype and subtype of entities is as follows:
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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 5 Solutions
EBK DATABASE CONCEPTS
Ch. 5 - Explain how entities are transformed into tables.Ch. 5 - Prob. 5.2RQCh. 5 - Prob. 5.3RQCh. 5 - What is denormalization?Ch. 5 - Prob. 5.5RQCh. 5 - Explain the problems that denormalized tables may...Ch. 5 - Explain how the representation of weak entities...Ch. 5 - Explain how supertype and subtype entities are...Ch. 5 - Prob. 5.9RQCh. 5 - Prob. 5.10RQ
Ch. 5 - Show two different ways to represent the 1:1...Ch. 5 - Prob. 5.12RQCh. 5 - Prob. 5.13RQCh. 5 - Prob. 5.14RQCh. 5 - Prob. 5.15RQCh. 5 - Prob. 5.16RQCh. 5 - For your answer to question 5.15, code an SQL...Ch. 5 - Prob. 5.18RQCh. 5 - Prob. 5.20RQCh. 5 - Prob. 5.21RQCh. 5 - Explain how the terms parent table and child table...Ch. 5 - For your answers to questions 5.20, 5.21, and...Ch. 5 - Prob. 5.24RQCh. 5 - Prob. 5.25RQCh. 5 - Prob. 5.26RQCh. 5 - Prob. 5.27RQCh. 5 - Prob. 5.28RQCh. 5 - Define the three types of recursive binary...Ch. 5 - Prob. 5.30RQCh. 5 - Prob. 5.31RQCh. 5 - Prob. 5.32RQCh. 5 - Prob. 5.33RQCh. 5 - Prob. 5.34RQCh. 5 - Code an SQL statement that creates a table with...
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