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relational join operation

См. также в других словарях:

  • Join — may refer to: * Join (law), to include additional counts or additional defendants on an indictment * Join (mathematics), a least upper bound in lattice theory * Join (relational algebra), a type of binary operator * Join (SQL), a SQL and… …   Wikipedia

  • Relational database — A visual diagram showing the relationship between the two tables, as indicated by the arrow A relational database matches data by using common characteristics found within the data set. The resulting groups of data uses the relational model (a… …   Wikipedia

  • Join (SQL) — An SQL join clause combines records from two or more tables in a database.[1] It creates a set that can be saved as a table or used as is. A JOIN is a means for combining fields from two tables by using values common to each. ANSI standard SQL… …   Wikipedia

  • Relational algebra — Not to be confused with Relation algebra. Relational algebra, an offshoot of first order logic (and of algebra of sets), deals with a set of finitary relations (see also relation (database)) that is closed under certain operators. These operators …   Wikipedia

  • Relational model — The relational model for database management is a database model based on first order predicate logic, first formulated and proposed in 1969 by Edgar Codd. [ Derivability, Redundancy, and Consistency of Relations Stored in Large Data Banks , E.F …   Wikipedia

  • Relational Database Management System — Eine relationale Datenbank dient zur elektronischen Datenverwaltung in Computersystemen und beruht auf dem relationalen Datenbankmodell. Dieses wurde 1970 von Edgar F. Codd erstmals vorgeschlagen und ist bis heute, trotz einiger Kritikpunkte, ein …   Deutsch Wikipedia

  • Relational Database Management Systems — Eine relationale Datenbank dient zur elektronischen Datenverwaltung in Computersystemen und beruht auf dem relationalen Datenbankmodell. Dieses wurde 1970 von Edgar F. Codd erstmals vorgeschlagen und ist bis heute, trotz einiger Kritikpunkte, ein …   Deutsch Wikipedia

  • Recursive join — The recursive join is an operation used in relational databases, also sometimes called a fixed point join . It is a compound operation that involves repeating the join operation, typically accumulating more records each time, until a repetition… …   Wikipedia

  • Theta join — In der Theorie der Datenbanken versteht man unter einer Relationenalgebra oder einer Relationalen Algebra eine formale Sprache, mit der sich Anfragen über einem relationalen Schema formulieren lassen. Sie erlaubt es, Relationen miteinander zu… …   Deutsch Wikipedia

  • Sort-merge join — The Sort Merge Join (also known as Merge Join) is an example of a join algorithm and is used in the implementation of a relational database management system. The basic problem of a join algorithm is to find, for each distinct value of the join… …   Wikipedia

  • Database — A database is an organized collection of data for one or more purposes, usually in digital form. The data are typically organized to model relevant aspects of reality (for example, the availability of rooms in hotels), in a way that supports… …   Wikipedia

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