# Fifth Normal Form (5NF)

A normal form where every nontrivial join dependency follows from candidate keys.

## What is **Fifth Normal Form (5NF)** in a relational database?

**Fifth Normal Form (5NF)** — A normal form where every nontrivial join dependency follows from candidate keys.

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

Updated: September 27, 2026

Source: https://www.ask-codey.com/glossary/fifth-normal-form-5nf