ORACLE 12C: SQL
17th Edition
ISBN: 9781305449947
Author: CASTEEL
Publisher: CENGAGE L
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Chapter 1, Problem 4RQ
Explanation of Solution
One-to-Many relationship (1:N):
Entity instance of one entity associated to many other entity instances is referred as one-to-many relationship.
- An entity instance is an occurrence of a particular entity.
Example:
The following example demonstrates a one-to-many relationship between manager entity and employee entity.
- A manager manages many employees in an organization...
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One-to-many relationships are defined.
What distinguishes a one-to-one relationship from a one-to-many relationship?
There are a number of potential difficulties that can arise when a relationship is split
vertically.
Chapter 1 Solutions
ORACLE 12C: SQL
Ch. 1 - Prob. 1RQCh. 1 - Prob. 2RQCh. 1 - Prob. 3RQCh. 1 - Prob. 4RQCh. 1 - Discuss the problems that can be caused by data...Ch. 1 - Explain the role of a primary key.Ch. 1 - Prob. 7RQCh. 1 - Prob. 8RQCh. 1 - What type of relationship can’t be stored in a...Ch. 1 - Identify at least three reasons an organization...
Ch. 1 - Prob. 1MCCh. 1 - Prob. 2MCCh. 1 - Prob. 3MCCh. 1 - Prob. 4MCCh. 1 - Prob. 5MCCh. 1 - Prob. 6MCCh. 1 - Prob. 7MCCh. 1 - Which of the following has no partial or...Ch. 1 - Prob. 9MCCh. 1 - Which of the following has no partial dependencies...Ch. 1 - Which of the following has no repeating groups but...Ch. 1 - Prob. 12MCCh. 1 - Prob. 13MCCh. 1 - A unique identifier for a data row that consists...Ch. 1 - Which of the following symbols represents an...Ch. 1 - Prob. 16MCCh. 1 - Which of the following represents a field in a...Ch. 1 - Which of the following defines a relationship in...Ch. 1 - When part of the data in a table depends on a...Ch. 1 - Which of the following is used to join data...Ch. 1 - Which tables and fields would you access to...Ch. 1 - Prob. 2HOACh. 1 - Prob. 3HOACh. 1 - Prob. 4HOACh. 1 - Access path A database table is composed of...Ch. 1 - Prob. 6HOACh. 1 - Prob. 7HOACh. 1 - Prob. 8HOACh. 1 - Prob. 9HOACh. 1 - Prob. 10HOA
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- Explain entity sets.arrow_forwardSchool system scenario Students come at the beginning of the school year to register in a school system and pay for the year’s fees..Each student is added to the appropriate class . each class has several teachers already registered in the system, tests are made by the teachers and the teacher adds the students' grades in the system, and at the end of the year the system issues students ’certificates. draw Entity Relationship diagram(ERD) from above scenarioarrow_forwardDesign an Entity Relationship Diagram for the following example:arrow_forward
- When is it important to use an associative entity to express a many-to-many relationship?arrow_forwardWhen a relationship is divided vertically, a number of potential complications might arise as a consequence.arrow_forwardWhen is it necessary to represent a many-to-many connection using an associated entity?arrow_forward
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