# Join Dependency

A constraint stating that a relation can be reconstructed by joining specified projections.

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

**Join Dependency** — A constraint stating that a relation can be reconstructed by joining specified projections.

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/join-dependency