In normalization, what does the term "functional dependency" mean?
- A functional dependency is a constraint between two sets of attributes in a relation from a database.
- A functional dependency is a relationship between two attributes where the value of one attribute uniquely determines the value of another attribute.
- A functional dependency refers to the process of establishing relationships between tables in a normalized database.
- A functional dependency refers to the removal of redundant data to improve database performance.
A functional dependency is a relationship between two attributes where the value of one attribute uniquely determines the value of another attribute. In other words, if X and Y are attributes of a relation, then Y is functionally dependent on X if each value of X is associated with precisely one value of Y. This concept is fundamental to normalization as it helps in identifying and eliminating redundancy in a database schema.
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