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Functional Dependencies and Normalization 5DV119 Introduction to Database Management Umeå University Department of Computing Science Stephen J. Hefner cs.um.SE http://www.cs.umu.se/hegnerFunctional
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How to fill out functional dependencies and normalization
How to fill out functional dependencies and normalization
01
To fill out functional dependencies, follow these steps:
02
Identify all the attributes in a relation.
03
Determine the functional dependencies by analyzing the relationships between the attributes.
04
Use the closure property to find the complete set of functional dependencies.
05
Represent the functional dependencies in a functional dependency diagram or a table.
06
To normalize a relation, follow these steps:
07
Identify the functional dependencies in the relation.
08
Analyze the dependencies to determine if the relation is in first normal form (1NF).
09
Decompose the relation into smaller relations, if necessary, to meet the conditions of 1NF.
10
Analyze the dependencies again to determine if the new relations are in second normal form (2NF).
11
Repeat the decomposition process until all the new relations are in third normal form (3NF) or higher.
12
Verify the resulting relations to ensure they are free from redundancy and anomalies.
Who needs functional dependencies and normalization?
01
Functional dependencies and normalization are important for anyone involved in database design and management.
02
Specifically, the following individuals or groups need functional dependencies and normalization:
03
- Database administrators: They need to ensure data integrity and eliminate data redundancy.
04
- Database designers: They need to design efficient and well-structured databases.
05
- Application developers: They need to write queries and code that interact with the database.
06
- Data analysts: They need to analyze and interpret data accurately.
07
- Business stakeholders: They need reliable and consistent data for decision-making.
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What is functional dependencies and normalization?
Functional dependencies refer to the relationship between attributes in a relation, while normalization is the process of organizing data in a database efficiently.
Who is required to file functional dependencies and normalization?
The database administrators or data analysts are typically responsible for filing functional dependencies and normalization.
How to fill out functional dependencies and normalization?
Functional dependencies and normalization are filled out by analyzing the attributes in a relation and organizing them into different normal forms to reduce redundancy.
What is the purpose of functional dependencies and normalization?
The purpose of functional dependencies and normalization is to ensure data integrity and improve database performance.
What information must be reported on functional dependencies and normalization?
Information such as attribute names, relationship between attributes, and which normal form each relation is in must be reported.
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