Titlebook: Nested Relations and Complex Objects in Databases; S. Abiteboul,P. C. Fischer,H. -J. Schek Conference proceedings 1989 Springer-Verlag Ber

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Rudi Studer,Stefan B?rnerojedes, Barinas, Apure and Portuguesa in the Venezuelan Llanos and in the states of Lara, Falcon, Anzoategui, and Trujillo in the semi-arid life zones of the country. The main arrangements promoted are living fences, scattered trees in pastures, trees in rows, grazing in tree plantations and intensi

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Arboreal

接合

Ligament

Flatter

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Recursively defined complex objects,ns. The basic idea is to allow for generalized, . definitions for complex object . which can be integrated in a high-level programming language type system..The underlying ‘recursive’ complex objects model allows for powerful and flexible means of representing hierarchically structured objects in an

cylinder

Query languages for Nested Relational Databases,y to exploit the power of this model. First, formal query languages are considered: a relational calculus defining the desired power of nested relational languages, and a relational algebra that provides a procedural language suitable for query optimization. Next, two higher-level languages are disc

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