join

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Join may refer to:

• Join (law), to include additional counts or additional defendants on an indictment
• In mathematics:
• Join (mathematics), a least upper bound of sets orders in lattice theory
• Join (topology), an operation combining two topological spaces
• Join (category theory), an operation combining two categories
• Join (simplicial sets), an operation combining two simplicial sets
• Join (sigma algebra), a refinement of sigma algebras
• Join (algebraic geometry), a union of lines between two varieties
• In computing:
• Join (relational algebra), a binary operation on tuples corresponding to the relation join of SQL
• Join (SQL), relational join, a binary operation on SQL and relational database tables
• join (Unix), a Unix command similar to relational join
• Join-calculus, a process calculus developed at INRIA for the design of distributed programming languages
• Join-pattern, generalization of Join-calculus
• Joins (concurrency library), a concurrent computing API from Microsoft Research
• Join Network Studio of NENU, a non-profit organization of Northeast Normal University
• Joins.com, the website for South Korean newspaper JoongAng Ilbo
• Joining (woodworking), woodworking processes of combining two or more pieces of wood together, generally through the use of nails.