# Duplicated Denormalized Columns

> The same fact copied into many columns and rows, so updates must touch every copy or leave them inconsistent.

Record: `lexicon:duplicated-denormalized-columns`
Kind: anti-pattern
Layer: [Contracts Core](https://banes-lab.com/records/layer/contracts-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lexicon-duplicated-denormalized-columns

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [Safe Use](https://banes-lab.com/records/lexicon/safe-use.md) and before [Functional Dependencies](https://banes-lab.com/records/lexicon/functional-dependencies.md).

## Category

- [Schema / Canonical Data / Semantics](https://banes-lab.com/records/lexicon-category/schema-canonical-data-semantics.md)

## Negated by

- [Database Normalization](https://banes-lab.com/records/architecture/database-normalization.md)

## Linked from

- [Schema / Canonical Data / Semantics](https://banes-lab.com/ontology/principles/architecture-category-schema-canonical-data-semantics.md)