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Encyclopedia > Join
Look up join in Wiktionary, the free dictionary.

Join may refer to: Wikipedia does not have an article with this exact name. ... Wiktionary (a portmanteau of wiki and dictionary) is a multilingual, Web-based project to create a free content dictionary, available in over 150 languages. ...

• join (SQL), a SQL and relational database operation
• join (law), to include additional counts or additional defendants on an indictment
• join (Unix), the Unix join command.
• In lattice theory, a join is a least upper bound
• Join (topology), an operation combining two topological spaces
• In relational algebra, the join is composition of relations.
• join calculus

A JOIN clause in SQL combines records from two tables in a relational database and results in a new (temporary) table, also called a joined table. Structured Query Language (SQL:2003) specifies two types of joins: inner and outer. ... Joinder is a legal term which refers to the inclusion of additional counts or additional defendants on an indictment. ... join is a command in Unix-like operating systems. ... The name lattice is suggested by the form of the Hasse diagram depicting it. ... In mathematics, a join on a set is defined either as unique suprema (least upper bounds) with respect to a partial order on the set, provided such suprema exist, or (abstractly) as a commutative and associative binary operation satisfying an idempotency law. ... Geometric join of two line segments. ... Relational algebra, an offshoot of first-order logic, is a set of relations closed under operators. ... The join-calculus is a process calculus developed at INRIA. The join-calculus was developed to provide a formal basis for the design of distributed programming languages, and therefore intentionally avoids communications constructs found in other process calculi, such as rendezvous communications, which are difficult to implement in a distributed...

Results from FactBites:

 join (1410 words) The join field is a field in each file on which the files are compared. Although it has been possible to include a join field in the output (by default, or by field number using -o), the join field could not be included for an unpaired line selected by -a. An alternative was considered: have the join field represent the union of the fields in the files (where they are identical for matched lines, and one or both are null for unmatched lines).
 Join (SQL) - Wikipedia, the free encyclopedia (1485 words) Mathematically, join is relation composition, the fundamental operation in relational algebra, and generalizing function composition. Join order: because joins are commutative, the order in which tables are joined does not change the final result set of the query. Join method: given two tables and a join condition, there are multiple algorithms to produce the result set of the join.
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