EBK DATABASE CONCEPTS
7th Edition
ISBN: 9780133777840
Author: AUER
Publisher: VST
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Question
Chapter 2, Problem 2.1RQ
Program Plan Intro
Relational model:
- In the relational model, data are organized in tables, which consist of rows and columns.
- A data in a row or column of a table are called fields.
- Fields in a
database table are also referred as attributes of a database object.- A group of related fields are called as a record, which is also called as database object or entity.
- A group of records are called a table.
- Keys in a relational database table refer to a key field.
- To identify each record in a table, there must be at least one data field that should be unique. That is, a corresponding data field of every record should be unique.
- Therefore, key field is used to identify the unique record from a collection of records.
- For example,
- Consider a database table named “Student” that contains the student details such as “StudentID”, “StudentName”, “Marks”, which are the fields of the table, and they are altogether called as records.
- The “StudentID” contains the registration number of students, “StudentName” contains name of students, and “Marks” contain the computer science marks of each student.
- Consider a database table named “Student” that contains the student details such as “StudentID”, “StudentName”, “Marks”, which are the fields of the table, and they are altogether called as records.
Expert Solution & Answer
Explanation of Solution
Importance of relational model:
Relational model is important, due to the following reasons
- It is important because it acts as the universal model to store the data in computers and it can be easily available.
- Specific values can be easily accessed through a database.
- It can be used for the designing and implementation of commercial database.
- Its data storage capacity can be extended and it won’t depend on physical organization.
- It includes the Structured Query Language (SQL).
- It includes various features like reduced data redundancy, portability, data integrity, constraining the input and many others.
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Chapter 2 Solutions
EBK DATABASE CONCEPTS
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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- Normalization of the relational model up to the 3rd Normal Form;arrow_forwardIs temporally variable information a thing in relational database design? Is that the case, what steps would you take to address the issue?arrow_forwardExplain in detail the relational model with a suitable example.arrow_forward
- Computer science How do you represent a 1:M unary relationship in a relational data model?arrow_forwardIf a relational model exists, what is the overall term for characteristics, and how are they used?arrow_forwardIf there is such a thing as a relational model, what is the overarching name for attributes, and how are they utilized?arrow_forward
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