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 2.25RQ
Explanation of Solution
Meaning of the Equation:
The given expression is,
A-> (B, C)
Explanation:
The meaning of the following equation is:
- Given a value for A, user can determine the value of both B and C simultaneously, represented as composite (B, C).
- Composite (B, C) is functionally dependent on A.
- A is determinant of the composite (B, C).
Example:
- For a table Employee containing attributes ‘employee_id’, ‘employee_name’ and ‘employee_department’, it is observed that user can fill an online form asking to enter the ‘employee_id’ and the
Database Management System (DBMS) searches the employee database and retrieves the information about ‘employee_name’ and ‘employee_department’ simultaneously...
Expert Solution & Answer
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Students have asked these similar questions
Quadratic Root Solver
For a general quadratic equation y = ax? + bx + c, the roots can be classified into
three categories depending upon the value of the discriminant which is given by
b2 - 4ac
First, if the discriminant is equal to 0, there is only one real root. Then, if the discriminant
is a positive value, there are two roots which are real and unequal. The roots can be
computed as follows:
-b+ Vb? – 4ac
2a
Further, if the discriminant is a negative value, then there are two imaginary roots. In
this case, the roots are given by
b
ь? - 4ас
2a
2a
Programming tasks:
A text file, coeff.txt has the following information:
coeff.txt
3
4
4
4
1
4
Each line represents the values of a, b and c, for a quadratic equation. Write a program
that read these coefficient values, calculate the roots of each quadratic equation, and display
the results. Your program should perform the following tasks:
• Check if the file is successfully opened before reading
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Explain the meaning of the following expression: A → (B, C) Given this expression, tell if it is also true that: A → B and: A → C
For the following pairs of expressions, find a unifier for each pair if a unifier exists. If a unifierdoes not exist, explain why.(a) p(X,Y) and p(a,Z)(b) p(X,X) and p(a,b)(c) f(X,Y) and f(a,g(a))(d) q(X) and ¬q(a)
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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