# Hash Join

A join algorithm that builds a hash table for one input and probes it with the other.

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

**Hash Join** — A join algorithm that builds a hash table for one input and probes it with the other.

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/hash-join