Database Concepts (7th Edition)
7th Edition
ISBN: 9780133544626
Author: David M. Kroenke, David J. Auer
Publisher: PEARSON
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Expert Solution & Answer
Chapter 2, Problem 2.8RQ
Explanation of Solution
Relation:
- Relation is a two-dimensional table in which data is named. The relations have the named columns and numbers which denote the unnamed rows.
- Although relation is defined as the two-dimensional table of data, not all the tables are considered as the relations.
- For example, let’s consider the bank
database - In this database, the “Customer” table stores the data about customer in the primary key column with the attribute “customer_id”.
- At the same time, the “Accounts” table also holds the data about bank accounts and associated customers.
- Therefore, these two tables such as “Customer” table and “Accounts” table can be linked together through the “customer_id” column to determine the relation that is present with the data from both the tables.
Tuple:
- In the relational model, data are organized in tables, which consist of rows and columns...
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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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- What is the link between a relation's main key and the functional dependencies among all of its attributes?arrow_forwardWhat is the connection between a relation's primary key and the functional relationships between all of its attributes?arrow_forwardWhen using subtype associations, talk about the database table choices that are accessible.arrow_forward
- Instructions: Write your answers by replacing the blue lines. Explain your answers if necessary. REGIONAL LABS CASE QUESTIONS Regional Labs is a company that conducts research and development work on a contract basis for other companies and organizations. Figure 3-32 shows data that Regional Labs collects about projects and the employees assigned to them. This data is stored in a relation (table) named PROJECT: PROJECT (ProjectID, EmployeeName, EmployeeSalary) Assuming that all functional dependencies are apparent in this data, which of the following are true? ProjectID ->EmployeeName _______ ProjectID ->EmployeeSalary _______ EmployeeName -> EmployeeSalary _______ EmployeeSalary -> ProjectID _______ EmployeeSalary -> (ProjectID, EmployeeName) ______ What is the primary key of PROJECT? ________________________________ Are all the non-key attributes (if any) dependent on the primary key?…arrow_forwardInstructions: Write your answers by replacing the blue lines. Explain your answers if necessary. REGIONAL LABS CASE QUESTIONS Regional Labs is a company that conducts research and development work on a contract basis for other companies and organizations. Figure 3-32 shows data that Regional Labs collects about projects and the employees assigned to them. This data is stored in a relation (table) named PROJECT: PROJECT (ProjectID, EmployeeName, EmployeeSalary) Assuming that all functional dependencies are apparent in this data, which of the following are true? ProjectID à EmployeeName _______ ProjectID à EmployeeSalary _______ EmployeeName à EmployeeSalary _______ EmployeeSalary à ProjectID _______ EmployeeSalary à (ProjectID, EmployeeName) ______ What is the primary key of PROJECT? ________________________________ Are all the non-key attributes (if any) dependent on the primary key? ____________________________________________…arrow_forwardPrimary key identifies a unique tuple of a relation, true or false?arrow_forward
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