EBK DATABASE SYSTEMS: DESIGN, IMPLEMENT
12th Edition
ISBN: 8220101450739
Author: Morris
Publisher: YUZU
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Question
Chapter 3, Problem 15P
Program Plan Intro
Primary Key:
A primary key in a
Example:
- Students in Universities are assigned a unique registration number.
- Therefore, in a STUDENT database table, the attribute “reg_no” acts as primary key.
Foreign Key:
Foreign key is a column in a relational database table which provides a relation between two tables. It provides a cross reference between tables by pointing to primary key of another table.
Example:
- In STUDENT database table, the attribute “reg_no” acts as primary key and in COURSE database table in which the student selects his or her course, the same “reg_no” acts as foreign key for the STUDENT table.
Many to One relationship:
When more than one record in a database table is associated with only one record in another table, the relationship between the two tables is referred as many to one relationship. It is also represented as M: 1 relationship.
One to Many relationships:
When one record in a database table is associated with more than one record in another table, the relationship between the two tables is referred as one to many relationships. It is also represented as1: M relationship. This is the opposite of many to one relationship.
CROW FOOT ERD:
The Crow Foot ERD is an Entity Relationship Diagram which is used to represent the cardinalities present in the basic ER diagram. It is used to represent the relationships present between two tuples or tables present in the database.
Expert Solution & Answer
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Students have asked these similar questions
Normalize the below given Student Course Plan to First Normal Form, Second NormalForm and Third Normal Form.
Customer
Equipment
Loan
id
equipmentCode
name
id
name
H description
RentalRatePerDay
address
04 equipment Code e
contact
startDate
dateOfBirth
returnDate
occupation
DamageReport
reportId
damageType
(iii)
Create a view named CustomerSummary with details of each customer, the
number of equipment rented, the total amount of rental collected thus far and
the number of damages caused by customer and not due to wear and tear.
ID
Name
Address
Contact
DateOfBirth Occupation
Number of Equipment Rented Total Rent NumDamage
ST82J
Charles Toles
23 Haig Road
92142331 15-03-1976 Teacher
20.00
S823F
Damien Low
5 Still Road
88128833 05-07-1985 Teacher
1
16.00
1
3
sa56F Audrey Ng
10 Bedok Road
82138213 23-01-1988 Nurse
3
150.00
1
2 Jalan Eunos
8 Jalan Melayu
Ali Bin Mohd Hassan 10 Clomonti Road 91239123
4
S345G
Betsey Tan
98981212 12-05-1990 Cartoonist
4.00
99234J
Peter Lee
97589758 04-03-1991 Student
1
24.00
SATSZ
S575J Ravi S/O Ramasamy 12 Jurong Road
6
10-07-1997 IT Programmer
0.00
7
82223333…
Select the best answer from the given choices:
Using the company schema, when creating the "works_on" table, the primary key should be
specified as
All of the answers are correct
primary key (essn, pno)
primary key (essn), primary key(pno)
primary key (essn) and primary key(pno)
Chapter 3 Solutions
EBK DATABASE SYSTEMS: DESIGN, IMPLEMENT
Ch. 3 - What is the difference between a database and a...Ch. 3 - Prob. 2RQCh. 3 - Prob. 3RQCh. 3 - What are the requirements that two relations must...Ch. 3 - Which relational algebra operators can be applied...Ch. 3 - Explain why the data dictionary is sometimes...Ch. 3 - A database user manually notes that The file...Ch. 3 - Prob. 8RQCh. 3 - Prob. 9RQCh. 3 - Prob. 10RQ
Ch. 3 - Prob. 11RQCh. 3 - Prob. 12RQCh. 3 - Use Figure Q3.13 to answer Questions 1317. FIGURE...Ch. 3 - Create the table that results from applying a...Ch. 3 - Write the relational algebra formula to apply an...Ch. 3 - Create the table that results from applying an...Ch. 3 - Using the tables in Figure Q3.13, create the table...Ch. 3 - Prob. 18RQCh. 3 - Prob. 19RQCh. 3 - Prob. 20RQCh. 3 - Identify and describe the components of the table...Ch. 3 - Identify the primary keys. FIGURE Q3.22 THE...Ch. 3 - Identify the foreign keys. FIGURE Q3.22 THE...Ch. 3 - Create the ERM. FIGURE Q3.22 THE CH03_THEATER...Ch. 3 - Create the relational diagram to show the...Ch. 3 - Prob. 26RQCh. 3 - What would be the conceptual view of the INDEX...Ch. 3 - Prob. 1PCh. 3 - Prob. 2PCh. 3 - Do the tables exhibit referential integrity?...Ch. 3 - Describe the type(s) of relationship(s) between...Ch. 3 - Prob. 5PCh. 3 - Prob. 6PCh. 3 - Prob. 7PCh. 3 - Prob. 8PCh. 3 - Create the relational diagram to show the...Ch. 3 - Prob. 10PCh. 3 - Prob. 11PCh. 3 - Create the relational diagram to show the...Ch. 3 - Prob. 13PCh. 3 - Do the tables exhibit referential integrity?...Ch. 3 - Prob. 15PCh. 3 - Prob. 16PCh. 3 - For each table, identify the primary key and the...Ch. 3 - Prob. 18PCh. 3 - Do the tables exhibit referential integrity?...Ch. 3 - Identify the TRUCK tables candidate key(s). FIGURE...Ch. 3 - For each table, identify a superkey and a...Ch. 3 - Prob. 22PCh. 3 - Prob. 23PCh. 3 - Prob. 24PCh. 3 - Create the ERD. (Hint: Look at the table contents....Ch. 3 - Prob. 26PCh. 3 - Prob. 27PCh. 3 - Prob. 28PCh. 3 - Create the table that would result from applying...Ch. 3 - Create the table that would result from applying...Ch. 3 - Create the table that would result from applying a...
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