# Merge Join

A join algorithm that advances through inputs ordered by their join keys.

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

**Merge Join** — A join algorithm that advances through inputs ordered by their join 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/merge-join