# Semijoin

A relational operation returning rows from one side that have a match on the other side.

## What is **Semijoin** in a relational database?

**Semijoin** — A relational operation returning rows from one side that have a match on the other side.

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

Updated: September 27, 2026

Source: https://www.ask-codey.com/glossary/semijoin