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join operator

См. также в других словарях:

  • Join (Unix) — join is a command in Unix like operating systems that merges the lines of two sorted text files based on the presence of a common field. It is a sort of implementation of the join operator used in relational databases but operating on text… …   Wikipedia

  • 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

  • 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

  • Operator No. 5 — The correct title of this article is Operator #5. The substitution or omission of the # sign is because of technical restrictions. Operator #5 Cover of issue #26, Death s Ragged Army, which began the Purple Invasion story arc. ©Argosy… …   Wikipedia

  • Closure operator — In mathematics, a closure operator on a set S is a function cl: P(S) → P(S) from the power set of S to itself which satisfies the following conditions for all sets X,Y ⊆ S. X ⊆ cl(X) (cl is extensive) X ⊆ Y implies cl(X) ⊆ cl(Y)   (cl… …   Wikipedia

  • Internet Relay Chat operator — The line that appears in an IRC Operator s client when they oper up An IRC operator (often abbreviated as IRCop or oper) is a user on an Internet Relay Chat network who has privileged access. IRC operators are charged with the task of enforcing… …   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

  • Hash join — The Hash join is an example of a join algorithm and is used in the implementation of a relational database management system.The task of a join algorithm is to find, for each distinct value of the join attribute, the set of tuples in each… …   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

  • Midwest Independent Transmission System Operator — Type Non profit: Independent System Operator; Regional Transmission Organization Headquarters Carmel, Indiana Website https://www.midwestiso.org …   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

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