Database Concepts (7th Edition)
7th Edition
ISBN: 9780133544626
Author: David M. Kroenke, David J. Auer
Publisher: PEARSON
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Chapter 2, Problem 2.15RQ
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Surrogate primary key:
- A system assigned primary key in a relational
database such as a serial number or any other which is not derived from any data in the database is known as surrogate primary key. - It is deputy of the primary key and will act as a primary key in the database and does not have any other significance.
- To simplify the primary key structures in the database, surrogate primary keys are created, and this ensures unique identification process in a relation.
Conditions to use the surrogate key:
The surrogate key for a relation is created when a primary key of a relation holds the below three conditions:
- If the relation has a composite primary key, then surrogate key should be created...
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Chapter 2 Solutions
Database Concepts (7th Edition)
Ch. 2 - Prob. 2.1RQCh. 2 - Define the term entity, and give an example of an...Ch. 2 - Prob. 2.3RQCh. 2 - Prob. 2.4RQCh. 2 - Prob. 2.5RQCh. 2 - Prob. 2.6RQCh. 2 - Prob. 2.7RQCh. 2 - Prob. 2.8RQCh. 2 - Prob. 2.9RQCh. 2 - Define the term unique key and give an example.
Ch. 2 - Prob. 2.11RQCh. 2 - Prob. 2.12RQCh. 2 - Prob. 2.13RQCh. 2 - Describe four uses of a primary key.Ch. 2 - Prob. 2.15RQCh. 2 - Prob. 2.16RQCh. 2 - Prob. 2.17RQCh. 2 - Explain the term foreign key, and give an example.Ch. 2 - Prob. 2.19RQCh. 2 - Prob. 2.20RQCh. 2 - Explain three possible interpretations of a null...Ch. 2 - Give an example of a null value (other than one...Ch. 2 - Prob. 2.23RQCh. 2 - Prob. 2.24RQCh. 2 - Prob. 2.25RQCh. 2 - Prob. 2.26RQCh. 2 - Prob. 2.27RQCh. 2 - Define the term primary key in terms of functional...Ch. 2 - Prob. 2.31RQCh. 2 - Examine the data in the Veterinary Office...Ch. 2 - Prob. 2.33RQCh. 2 - Describe a modification problem that occurs when...Ch. 2 - Prob. 2.35RQCh. 2 - Prob. 2.36RQCh. 2 - Prob. 2.37RQCh. 2 - Apply the normalization process to the Veterinary...Ch. 2 - Prob. 2.39ECh. 2 - Prob. 2.40E
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.Similar questions
- How exactly do foreign keys ensure that a database's integrity is preserved? What kind of proof do you have to back your claim?arrow_forwardWhy can a foreign key have a NULL value but a primary key cannot?arrow_forwardWhen it comes to integrity restrictions, what is the difference between the two?arrow_forward
- How can the key and foreign key constraints be enforced by the DBMS?arrow_forwardExplain the role of a foreign key in maintaining referential integrity. Provide a detailed example in the context of a bank.arrow_forwardWhat happens if your database's referential integrity is not enforced? Are there any common mistakes?arrow_forward
- What would happen if there was a breach in the database's referential integrity? Just how frequently do you err, and what are they?arrow_forwardIf a foreign key is used to protect the database, why is that necessary? Is there any kind of justification for the significance of this?arrow_forwardIn terms of database integrity, what does a foreign key mean? Is there anything you can say to explain why this is required?arrow_forward
- In terms of database integrity, what is the function of the foreign key? Is there a particular rationale behind your actions?arrow_forwardThere may be serious repercussions if a database's referential integrity were compromised. What errors do you commit most frequently?arrow_forwardAccess path A database table is composed of records and fields hold data. Data is stored in records. A field is a part of a record and contains a single piece of data for the subject of the record. The access path for finding the list of books is AUTHOR: AuthorID, Lname BOOKAUTHOR: AuthorID, ISBN BOOKS: Pubdate, ISBNarrow_forward
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