# Functional Dependency

A rule where one set of attributes determines another set of attributes.

## What is **Functional Dependency** in a relational database?

**Functional Dependency** — A rule where one set of attributes determines another set of attributes.

Level: Journeyman · [More Database terms at this level](https://www.ask-codey.com/glossary/subjects/database/journeyman)

Updated: September 27, 2026

Source: https://www.ask-codey.com/glossary/functional-dependency