Entity–attribute–value Model

Entity–attribute–value model (EAV) is a data model to describe entities where the number of attributes (properties, parameters) that can be used to describe them is potentially vast, but the number that will actually apply to a given entity is relatively modest. In mathematics, this model is known as a sparse matrix. EAV is also known as object–attribute–value model, vertical database model and open schema.

There are certain cases where an EAV schematic is an optimal approach to data modelling for a problem domain. Howev, in many cases where data can be modelled in statically relational terms an EAV based approach is an anti-pattern which can lead to longer devopment times, poor use of database resources and more complex queries when compared to a relationally-modelled data schema.

Read more about Entityattribute–value ModelStructure of An EAV Table, EAV Databases, EAV Versus Row Modeling, Representing Substructure: EAV With Classes and Relationships (EAV/CR), The Critical Role of Metadata in EAV Systems, Scenarios That Are Appropriate For EAV Modeling, Working With EAV Data, Sparse Columns As An Alternative To EAV, Alternative XML, EAV and Cloud Computing, Tree Structures and Relational Databases, History of EAV Database Systems

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Entity–attribute–value Model - History of EAV Database Systems
... Codd's relational database model were available, though HELP was much later ported to a relational architecture and commercialized by the 3M corporation ... of diminishing its accessibility among non-computer-science types and consequently delaying the model's acceptance in IT and software-vendor circles ...

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