# Functional Dependencies

> The requirement that the dependencies determining which attributes fix others be identified before decomposing a schema.

Record: `lexicon:functional-dependencies`
Kind: constraint
Layer: [Contracts Core](https://banes-lab.com/records/layer/contracts-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lexicon-functional-dependencies

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [Duplicated Denormalized Columns](https://banes-lab.com/records/lexicon/duplicated-denormalized-columns.md) and before [Read Performance](https://banes-lab.com/records/lexicon/read-performance.md).

## Category

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

## Required 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)