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Entity–attribute–value model

An entity–attribute–value model (EAV) is a data model optimized for the space-efficient storage of sparse—or ad-hoc—property or data values, intended for situations where runtime usage patterns are arbitrary, subject to user variation, or otherwise unforeseeable using a fixed design. The use-case targets applications which offer a large or rich system of…

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Overview

Data structure

History

Use in databases

EAV/CR: representing substructure with classes and relationships

Metadata

Usage scenarios

Alternatives

Cloud computing offerings

Advanced semantic analysis

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Map overview Semantic statistics

Entity–attribute–value model

Nodes84
Edges83
Triples47
Avg. degree1.98
Density0.02381
Components1

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Important terminology Word statistics

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Important terminology

data eav metadata table attributes attribute database tables sparse relational columns system value example one also entity values type use

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Doritos or Diet Coke as columns in a tableinstance ofNo competent database designer would hard-code individual products0.80text
packaging unitinstance ofbut both have common attributes0.80text
per-item cost.Description of conceptsThe entityIn clinical datainstance ofbut both have common attributes0.80text
the entity is typically a clinical eventinstance ofbut both have common attributes0.80text
as described aboveinstance ofbut both have common attributes0.80text
per-item costinstance ofbut both have common attributes0.80text
natural language processinginstance ofa standard now managed by the Apache Foundation and employed in areas0.80text
cylindersinstance ofand the engine has components0.80text
statistics packagesinstance ofand many software applications0.80text
regard itinstance ofand many software applications0.80text
i.e.instance ofand many software applications0.80text
as conventional rowsinstance ofand many software applications0.80text

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