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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]
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.
A relational database (RDB [1]) is a database based on the relational model of data, as proposed by E. F. Codd in 1970. [ 2 ] A Relational Database Management System (RDBMS) is a type of database management system that stores data in a structured format using rows and columns .
Relationalism, in the broadest sense, applies to any system of thought that gives importance to the relational nature of reality.In its narrower and more philosophically restricted sense, as propounded by the Indian philosopher Joseph Kaipayil [1] [2] [3] and others, relationalism refers to the theory of reality that interprets the existence, nature, and meaning of things in terms of their ...
Codd continued to develop and extend his relational model, sometimes in collaboration with Christopher J. Date. [24] One of the normalised forms, the Boyce–Codd normal form, is named after him. [25] Codd's theorem, a result proven in his seminal work on the relational model, equates the expressive power of relational algebra and relational ...
Logicians sometimes refer to structures as "interpretations", [2] whereas the term "interpretation" generally has a different (although related) meaning in model theory; see interpretation (model theory). In database theory, structures with no functions are studied as models for relational databases, in the form of relational models.
This page focuses on finitary first order model theory of infinite structures.. The relative emphasis placed on the class of models of a theory as opposed to the class of definable sets within a model fluctuated in the history of the subject, and the two directions are summarised by the pithy characterisations from 1973 and 1997 respectively:
Database normalization is the process of structuring a relational database in accordance with a series of so-called normal forms in order to reduce data redundancy and improve data integrity.