EBK DATABASE CONCEPTS
7th Edition
ISBN: 9780133777840
Author: AUER
Publisher: VST
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Chapter 2, Problem 2.19RQ
Explanation of Solution
According to the reference of book, the terms “primary key” and “foreign key” are defined as follows:
Primary key:
- Primary key is like a candidate key in which it uniquely identifies each row in a relation.
- For example consider that there is an “Employee” table in which “emp_id” is unique so it is chosen as a primary key in
database table. - In this book, primary keys are underlined.
- For example consider that there is an “Employee” table in which “emp_id” is unique so it is chosen as a primary key in
Foreign key:
- To maintain the relationship between the database tables, the values are placed from one relation to second relation.
- The values used in first relation come under the primary key values whereas the values that are referred in second relation come under the foreign key...
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Find the error:
daily_sales = [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
days_of_week = ['Sunday', 'Monday', 'Tuesday',
'Wednesday', 'Thursday', 'Friday',
'Saturday']
for i in range(7):
daily_sales[i] = float(input('Enter the sales for ' \
+ day_of_week[i] + ': ')
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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