given an example of a functional dependency. write the functional dependency in the form a-->b where...

given an example of a functional dependency. write the functional dependency in the form a-->b

where attribute a funcitonally determines attribute b

now write an argument concvincing us that attribute a functionally determines attribute b.

Expert Solution

FUNCTIONAL DEPENDENCY

- Functional dependency describes the relationship between attributes in a Database Management System.

- Functional Dependency helps us to maintain the quality of a database

A

------------------->

B

- The above representation depicts A is functionally dependant on B.

- denoted by A----> B , if each value of A is associated with exactly one value of B

- A and B may contain one or more attributes

Example:-

For a relation, PersonID functionally determine BirthDate. That is the functional dependancy can be shown as:

PersonID ---------------------> BirthDate

In the above relation, there is exactly one BirthDate for given instance of a person. Note that converse may or may not be true. Many people may have same birthdates. For a given BirthDate , we may find many PersonID sharing the same BirthDate

Functional dependencies are divided into transitive , trivial and multivalued

venereology answered 1 year ago

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