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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.
The type 5 slowly changing dimension allows the currently-assigned mini-dimension attribute values to be accessed along with the base dimension's others without linking through a fact table. Logically, we typically represent the base dimension and current mini-dimension profile outrigger as a single table in the presentation layer.
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 ...
K is a set of keys, taken from a countable set, defining the nature of attributes/properties; V is a set of values, to be associated with these keys in order to define full-fledged attributes: is a total function, defining the multigraph proper. For a ∈ A, u∈ N, v ∈ N, α (a) = (u, v) means that a is an arc of the graph having node u for ...
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
Attribute values can be set-valued or atomic-valued. Set-valued attributes contain more than one atomic value. Examples are role and project. Atomic-valued attributes contain only one atomic value. Examples are clearance and sensitivity. Attributes can be compared to static values or to one another, thus enabling relation-based access control.