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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 ...
For example, the Entity–attribute–value model#EAV versus row modeling and Entity–attribute–value model#The Entity sections are nearly verbatim. This appears to be a copyright violation, and the material should probably be removed or heavily rewritten. RossPatterson 19:47, 25 July 2015 (UTC)
Entity–relationship model (4 P) R. Relational model (2 C, 28 P) Pages in category "Database models" ... Entity–attribute–value model; F. Flat-file database; G ...
Example of a web form with name-value pairs. A name–value pair, also called an attribute–value pair, key–value pair, or field–value pair, is a fundamental data representation in computing systems and applications. Designers often desire an open-ended data structure that allows for future extension without modifying existing code or data.
In general, an attribute–value system may contain any kind of data, numeric or otherwise. An attribute–value system is distinguished from a simple "feature list" representation in that each feature in an attribute–value system may possess a range of values (e.g., feature P 1 below, which has domain of {0,1,2}), rather than simply being ...
Properties are key-value pairs where keys are character strings and values are numbers or character strings. They are analogous to attributes in entity-attribute-value and object-oriented modeling. By contrast, in RDF graphs, "properties" is the term for the arcs. This is why a clearer name is attributed graphs, or graphs with properties.
The inverted file data model can put indexes in a set of files next to existing flat database files, in order to efficiently directly access needed records in these files. Notable for using this data model is the ADABAS DBMS of Software AG, introduced in 1970. ADABAS has gained considerable customer base and exists and supported until today.
Entity–attribute–value model; Equality-generating dependency; Evolutionary database design; Exclusive relationship (programming) F. Fixed-point logic; Full table ...