询问 发表于 2025-3-30 10:55:50

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reperfusion 发表于 2025-3-30 13:37:54

A data model for complex objects based on a semantic database model and nested relations,This paper presents an overview of a data model for complex objects called EXTREM (EXTended RElational Model). EXTREM is based on the semantic database model IFO [AbH.EXTREM is compared with other semantic database models. The EXTREM object algebra and user interfaces are briefly summarized.

Fracture 发表于 2025-3-30 17:11:03

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不再流行 发表于 2025-3-31 00:09:40

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hedonic 发表于 2025-3-31 01:41:32

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艰苦地移动 发表于 2025-3-31 06:56:31

Fima Klebaner,Robert Liptserurrent development of science and technology challenges the scientific community to provide innovative engineering solutions and encourages undertaking research on optimal solutions for mechatronic systems which include, inter alia, wheeled mobile robots and robotic manipulators. The issues relating

秘传 发表于 2025-3-31 11:53:41

res noch eine glühende Masse bildet, während das Äußere zu einer festen Schale, der „Erdrinde“, geworden ist. Sie ist aus silikatischem Gesteinsmaterial (in erster Linie Silikatverbindungen der Leichtmetalle) zusammengesetzt und besitzt eine mittlere Dichte von 2,7. Ihre Dicke ist erstaunlich gering
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查看完整版本: Titlebook: Nested Relations and Complex Objects in Databases; S. Abiteboul,P. C. Fischer,H. -J. Schek Conference proceedings 1989 Springer-Verlag Ber