---
title: "Column Duplication — Database Glossary | Xata"
description: "A migration technique where a new column is created alongside the existing one, data is backfilled, and triggers synchronize both columns until all appl..."
source: "https://xata.io/glossary/column-duplication"
---

# Column Duplication

Schema Migrations[Open Source](https://github.com/xataio)

A migration technique where a new column is created alongside the existing one, data is backfilled, and triggers synchronize both columns until all applications have migrated.

Related terms

[pgroll](/glossary/pgroll)[Backfill](/glossary/backfill)

[← Back to glossary](/glossary)