join of relation

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• join — join, conjoin, combine, unite, connect, link, associate, relate are comparable when meaning to attach or fasten one thing to another or several things to each other or to become so attached or fastened. Join stresses the bringing or coming… …   New Dictionary of Synonyms

• 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

• Join (mathematics) — In mathematical order theory, join is a binary operation on a partially ordered set that gives the supremum (least upper bound) of its arguments, provided the least upper bound exists. The join of elements x and y is denoted x lor y. A partially… …   Wikipedia

• Join and meet — In mathematics, join and meet are dual binary operations on the elements of a partially ordered set. A join on a set is defined as the (necessarily unique) supremum (least upper bound) with respect to a partial order on the set, provided a… …   Wikipedia

• join — joinable, adj. /joyn/, v.t. 1. to bring in contact, connect, or bring or put together: to join hands; to join pages with a staple. 2. to come into contact or union with: The brook joins the river. 3. to bring together in a particular relation or… …   Universalium

• join — [[t]dʒɔɪn[/t]] v. t. 1) to bring or put together or in contact; connect: to join hands[/ex] 2) to come into contact or union with: The brook joins the river[/ex] 3) to bring together in a particular relation or for a specific purpose; unite: to… …   From formal English to slang

• join — /dʒɔɪn / (say joyn) verb (t) 1. to bring or put together, in contact or connection. 2. to come into contact, connection, or union with: the brook joins the river. 3. to bring together in relation, purpose, action, coexistence, etc.: to join… …  

• join — I. verb Etymology: Middle English, from Anglo French joindre, from Latin jungere more at yoke Date: 13th century transitive verb 1. a. to put or bring together so as to form a unit < join two blocks of wood with glue > b. to connect (as points)… …   New Collegiate Dictionary

• Join (topology) — In topology, a field of mathematics, the join of two topological spaces A and B , often denoted by Astar B, is defined to be the quotient space: A imes B imes I / R, , where I is the interval [0, 1] and R is the relation defined by: (a, b 1, 0)… …   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