A Guide to SQL
9th Edition
ISBN: 9781111527273
Author: Philip J. Pratt
Publisher: Course Technology Ptr
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Chapter 2, Problem 1CAT
Program Plan Intro
Normalization:
- Normalization refers to the method of representing a
database in the terms of relations, which are in the standard normal forms. - It is organized in a table manner to reduce data redundancy and data dependency.
First Normal Form (1NF):
A table or a relation is said to be in first normal form if and only if the domain of each attribute consists of only unique values and the value of each attribute consists of only a single value.
Second Normal Form (2NF):
A table or a relation is said to be in second normal form if and only if it is in first normal form and no non-key attribute of the table is dependent on only a portion of the primary key.
Third Normal Form (3NF):
A table or a relation is said to be in third normal form if and only if it is in second normal form and if the candidate keys are its only determinants.
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Implement a new independent entity phone in the Sakila database. Attributes and relationships are shown in the diagram below
The diagram uses Sakila naming conventions. Follow the Sakila conventions for your table and column names:
All lower case
Underscore separator between root and suffix
Foreign keys have the same name as referenced primary key
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ALTER TABLE customer ADD FOREIGN KEY (phone_id) REFERENCES phone(phone_id) ON DELETE SET NULL ON UPDATE CASCADE;
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phone_id, phone_number, and country_code have data type INT.
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Implement a new independent entity phone in the Sakila database. Attributes and relationships are shown in the following diagram:
The diagram uses Sakila naming conventions. Follow the Sakila conventions for your table and column names:
All lower case
Underscore separator between root and suffix
Foreign keys have the same name as referenced primary key
Write CREATE TABLE and ALTER TABLE statements that:
Implement the entity as a new phone table.
Implement the has relationships as foreign keys in the Sakila customer, staff, and store tables.
Remove the existing phone column from the Sakila address table.
Step 2 requires adding a foreign key constraint to an existing table. Ex:
ALTER TABLE customer ADD FOREIGN KEY (phone_id) REFERENCES phone(phone_id) ON DELETE SET NULL ON UPDATE CASCADE;
Specify data types as follows:
phone_id, phone_number, and country_code have data type INT.
phone_type has date type VARCHAR(12) and contains strings like 'Home', 'Mobile', and 'Other'.
Apply…
Chapter 2 Solutions
A Guide to SQL
Ch. 2 - Prob. 1RQCh. 2 - What is an attribute?Ch. 2 - What is a relationship? What is a one-to-many...Ch. 2 - Prob. 4RQCh. 2 - What is a relation?Ch. 2 - Prob. 6RQCh. 2 - Prob. 7RQCh. 2 - How do you qualify the name of a field, and when...Ch. 2 - Prob. 9RQCh. 2 - What is a primary key? What is the primary key for...
Ch. 2 - Prob. 11RQCh. 2 - Prob. 12RQCh. 2 - Define second normal form. What types of problems...Ch. 2 - Define third normal form. What types of problems...Ch. 2 - Prob. 15RQCh. 2 - Prob. 16RQCh. 2 - List the changes you would need to make to your...Ch. 2 - Prob. 1TDCh. 2 - Prob. 2TDCh. 2 - Prob. 3TDCh. 2 - Prob. 4TDCh. 2 - Prob. 5TDCh. 2 - Prob. 1CATCh. 2 - Identify the functional dependencies in the...Ch. 2 - Prob. 3CATCh. 2 - Determine the functional dependencies that exist...Ch. 2 - Prob. 2SCGCh. 2 - Prob. 3SCG
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