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The relational model (RM) is an approach to managing data using a structure and language consistent with first-order predicate logic, first described in 1969 by English computer scientist Edgar F. Codd, [1] [2] where all data are represented in terms of tuples, grouped into relations.
The four relational models are as follows: Communal sharing (CS) relationships are the most basic form of relationship where some bounded group of people are conceived as equivalent, undifferentiated and interchangeable such that distinct individual identities are disregarded and commonalities are emphasized, with intimate and kinship relations being prototypical examples of CS relationship. [2]
Database theory encapsulates a broad range of topics related to the study and research of the theoretical realm of databases and database management systems.. Theoretical aspects of data management include, among other areas, the foundations of query languages, computational complexity and expressive power of queries, finite model theory, database design theory, dependency theory, foundations ...
"The entity-relationship model adopts the more natural view that the real world consists of entities and relationships. It incorporates some of the important semantic information about the real world." [2] In his original 1976 article Chen explicitly contrasts entity–relationship diagrams with record modelling techniques:
The relational perspective became a major theory development in the field. It took nearly 15 years for Ledingham and Bruning (1998) to propose a working definition of relationship management. Hon and Grunig (1999) outlined measurements for organisational relationships and suggested strategies that could be helpful in understanding these ...
Comparison of reference management software for software supporting the MODS format; Metadata Authority Description Schema (MADS) created to serve as a companion to the Metadata Object Description Schema (MODS). MADS describes authorities (as in authority control), meaning people, organizations, geographical location etc. involved in creating ...
The definition of generic data model is similar to the definition of a natural language. For example, a generic data model may define relation types such as a 'classification relation', being a binary relation between an individual thing and a kind of thing (a class) and a 'part-whole relation', being a binary relation between two things, one with the role of part, the other with the role of ...
Respect des fonds, or le respect pour les fonds, is a principle in archival theory that proposes to group collections of archival records according to their fonds (according to the entity by which they were created or from which they were received).