# Third Normal Form (3NF)

Second normal form with non-key attributes depending on keys rather than other non-key attributes.

## What is **Third Normal Form (3NF)** in a relational database?

**Third Normal Form (3NF)** — Second normal form with non-key attributes depending on keys rather than other non-key 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/third-normal-form-3nf