Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Chapter 6, Problem 13PE
Explanation of Solution
a.
ER diagram:
Explanation:
- In the above diagram, the primary key attributes student id and instructor id are assumed to be immutable, that is they are not allowed to change with time. All other attributes are assumed to potentially change with time...
Explanation of Solution
b.
student(student_id)
student_valid_times(student_id, start_time, end_time)
student_name(student_id, value, start_time, end_time
student_dept_name(student_id, value, start_time, end_time
student_tot_cred(student_id, value, start_time, end_time
instructor(instructor_id)
instructor_valid_times(instructor_id, start_time, end_time)
instructor_name(instructor_id, value, start_time, end_time
instructor_dept_name(instructor_id, value, start_time, end_time
instructor_salary(instructor id, value, start time, end time
advisor(student_id, instructor_id, start_time, end_time)
Explanation:
- The generated relations are as shown below...
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I need fixing my a matlab code to find the currents USING MARTIXS AND INVERSE to find the current
% At this point We Enter the Resistor values and Voltage Source Values
fprintf('Provide Resistance Values for the Resistors as Requested: \n');
fprintf('===============================================\n');
R1x = input('Enter the value for R1 in kohms: ');
R2x = input('Enter the value for R2 in kohms: ');
R3x = input('Enter the value for R3 in kohms: ');
R4x = input('Enter the value for R4 in kohms: ');
fprintf('Provide voltage values for as requested: \n');
fprintf('===============================================\n');
E1 = input('Enter the value of E1 in Volts: ');
E2 = input('Enter the value of E2 in Volts: ');
E3 = input('Enter the value of E3 in Volts: ');
fprintf('===============================================\n');
% Scaling FACTOR multiplication of resistors by 1000 (1K) each
R1 = 1000 * R1x;
R2 = 1000 * R2x;
R3 = 1000 * R3x;
R4 = 1000 * R4x;
fprintf('VALUES YOU HAVE ENTERED FOR YOUR…
Chapter 6 Solutions
Database System Concepts
Ch. 6 - Prob. 1PECh. 6 -
Consider a database that includes the entity sets...Ch. 6 -
Design an E-R diagram for keeping track of the...Ch. 6 - Prob. 4PECh. 6 - Prob. 5PECh. 6 - Prob. 6PECh. 6 - Prob. 7PECh. 6 -
Consider a relation such as sec_course, generated...Ch. 6 -
Suppose the advisor relationship set were...Ch. 6 - Prob. 10PE
Ch. 6 - Prob. 11PECh. 6 - Prob. 12PECh. 6 - Prob. 13PECh. 6 - Prob. 14ECh. 6 - Prob. 15ECh. 6 - Prob. 16ECh. 6 - Prob. 17ECh. 6 -
Consider two entity sets A and B that both have...Ch. 6 - Prob. 19ECh. 6 - Prob. 20ECh. 6 - Prob. 21ECh. 6 - Prob. 22ECh. 6 - Prob. 23ECh. 6 -
Design a database for an airline. The database...Ch. 6 - Prob. 25ECh. 6 -
Design a generalization – specialization...Ch. 6 -
Explain the distinction between disjoint and...Ch. 6 -
Explain the distinction between total and partial...
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