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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 ...
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.
"The so-called open schema solution is quite popular. In this solution, you have the main Products table with common attributes. Then you add an Entity-Attribute-Value (EAV) table, which has three columns: product ID, attribute name, and attribute value. This is a completely dynamic solution, and is quite simple.
Therefore, RDF uses subject instead of object (or entity) in contrast to the typical approach of an entity–attribute–value model in object-oriented design: entity (sky), attribute (color), and value (blue). RDF is an abstract model with several serialization formats (being essentially specialized file formats). In addition the particular ...
The named columns of the relation are called attributes, and the domain is the set of values the attributes are allowed to take. The basic data structure of the relational model is the table, where information about a particular entity (say, an employee) is represented in rows (also called tuples) and columns.
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.
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 ...
EAV may refer to: East Atlanta Village, in Atlanta, Georgia; Electroacupuncture, an alternative medicine diagnostic device; Equine arteritis virus, the causal agent of equine viral arteritis; Entity–attribute–value model, a data model; Erste Allgemeine Verunsicherung, an Austrian band; Expired air ventilation; Exposure action value