- conceptual entity
- 概念实体
Medical Chinese dictionary (湘雅医学词典). 2013.
conceptual entity
Look at other dictionaries:
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… … Wikipedia
Entity-attribute-value model — (EAV), also known as object attribute value model and open schema is a data model that is used in circumstances where the number of attributes (properties, parameters) that can be used to describe a thing (an entity or object ) is potentially… … Wikipedia
Conceptual model — For other uses, see Model (disambiguation). In the most general sense, a model is anything used in any way to represent anything else. Some models are physical objects, for instance, a toy model which may be assembled, and may even be made to… … Wikipedia
Conceptual schema — A conceptual schema or conceptual data model is a map of concepts and their relationships. This describes the semantics of an organization and represents a series of assertions about its nature. Specifically, it describes the things of… … Wikipedia
Entity-relationship model — A sample Entity relationship diagram using Chen s notation In software engineering, an entity relationship model (ERM) is an abstract and conceptual representation of data. Entity relationship modeling is a database modeling method, used to… … Wikipedia
Conceptual system — A conceptual system is a system that is composed of non physical objects, i.e. ideas or concepts. In this context a system is taken to mean an interrelated, interworking set of objects . Contents 1 Overview 1.1 Examples 2 Related topics … Wikipedia
Conceptual model (computer science) — A mental model captures ideas in a problem domain, while a conceptual model represents concepts (entities) and relationships between them. A Conceptual model in the field of computer science is also known as a domain model. Conceptual modeling… … Wikipedia
Entity class — When Dr. Chen developed entity/relationship modeling [1] (commonly known as data modeling), he used the term entity type to define the boxes on his diagrams as representing classes of things. For example Person would be an entity type, and Sally… … Wikipedia
entity-relationship diagram — noun A graphical representation of entities and their relationships to each other in a conceptual data model. Syn: ER diagram See Also: entity relationship model … Wiktionary
entity-relationship model — noun An abstract conceptual representation of structured data. See Also: entity relationship diagram … Wiktionary
entity — An independent thing; that which contains in itself all the conditions essential to individuality; that which forms of itself a complete whole; medically, denoting a separate and distinct disease or condition. [L. ens (ent ), being, pres. p. of… … Medical dictionary
