relációs

Relációs is a Hungarian adjective derived from reláció (relation). It is used to describe anything pertaining to relations—relationships between entities or elements—in various disciplines, most notably mathematics, logic, computer science and information systems. The term signals a focus on how objects are connected rather than only on the objects themselves.

In mathematics and logic, a relation between sets A and B is a subset of the Cartesian product A×B. A relation may have various arities (binary, ternary, etc.). Binary relations include equality, orderings and adjacency. Relations differ from functions in that a relation can associate an object with multiple partners. Properties such as reflexivity, symmetry and transitivity are often studied for relations.

In computer science, particularly in databases, relációs refers to the relational model of data. Proposed by E. F. Codd, it represents data as relations (tables) composed of tuples (rows) and attributes (columns). Relationships between tables are established via keys, especially primary keys and foreign keys. The relational model supports operations through relational algebra and SQL, and underpins concepts such as join, projection and selection. The idea emphasizes data independence and flexible querying. The term relációs adatbázis translates to relational database, and relációs adatmodell to relational data model.

In other areas, relációs appears in information systems, linguistics and knowledge representation to describe relational structures, semantic roles or networked associations.