Relational (database): (searchsqlserver definition) is a collection of data items organized as a set of formally-described tables from which data can be accessed or reassembled in many different ways without having to reorganize the database tables. The relational database was invented by E. F. Codd at IBM in 1970

Relational (art): “A set of artistic practices which take as their theoretical and practical point of departure the whole of human relations and their social context, rather than an independent and private space.”

Bourriaud (1998)

Relational (Subject) Bersani (2005) defines the relational subject as constituted by and as subject positions, emptying the opposition between subject and object of meaning. Art, Bersani goes on, “illuminates relationality by temporarily and heuristically immobilising relations”.

Logic of relation. Massumi  (1997) “What would it mean to give a logical consistency to the in-between? It would mean realigning with a logic of relation. For the in-between, as such, is not a middling being, but rather the being of the middle - the being of a relation. A positioned being, central, middling or marginal, is a term of a relation... But as the work of Gilles Deleuze repeatedly emphasizes, it is in fact an indispensable step toward conceptualizing change as anything more or other than a negation, deviation, rupture, or subversion.”

Bersani 2005 transform.eipcp.net 2005 Another Relationality. Rethinking Art as Experience

Bourriaud, N. 1998 Relational Aesthetics. les presses du reel

Massumi, B. 1997 The Political Economy of Belonging and the Logic of Relation in: Cynthia Davidson. Anybody. MIT Press

http://searchsqlserver.techtarget.com/definition.relational-database 

last accessed 22 November 2011