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A functional dependency is an association between two attributes of the same relational database table. One of the attributes is called the determinant and the other attribute is called the determined. For each value of the determinant there is associated one and only one value of the determined.
For More Help you can click on below links:
http://ecomputernotes.com/fundamental/what-is-a-database/functional-dependence
https://opentextbc.ca/dbdesign/chapter/chapter-11-functional-dependencies/
