杀子女者
发表于 2025-3-28 15:48:18
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BURSA
发表于 2025-3-28 22:40:38
E. S. Garnett,G. Firnau,C. Nahmias, relationships, attributes, values, actors, messages, etc. Usually these words have a certain meaning and usually their usage is according to that meaning. In this paper we will describe how a Lexicon, containing these words and their meaning, can be used fruitfully when combined with a CASE tool.
细查
发表于 2025-3-28 23:35:48
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现代
发表于 2025-3-29 05:07:06
Karel van Hulle,Leo van der Tasierarchy of components that constitute a system as layers of alternating specification and implementation. If one considers the principles of abstraction and encapsulation, one can see that this viewpoint is quite natural. Abstraction implies that all implementations are implementations of . specifi
金盘是高原
发表于 2025-3-29 10:28:27
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内疚
发表于 2025-3-29 15:11:05
Overall ideas are two basic constructs, one for universal (ℬ) quantifier and another for existential (∃) quantifier. Then a nesting feature is considered to obtain general expressive power. The major contribution of this paper is that, for every query specification with any depth of nesting of quan
罗盘
发表于 2025-3-29 16:11:18
Cecilia Lwiindi Nedziwe,Oluwaseun Tella. The schema information is supplied as an enhanced entity relationship (EER) model which is transformed by a one-to-one mapping into a set of ground facts. The application data corresponding to the schema is also represented by ground facts in a single table. In order to check whether the applicati
Certainty
发表于 2025-3-29 21:34:00
Transnational Actors in Global Governanceer, we examine the problem of view update in Entity-Relationship based database management systems where the conceptual schema is represented by a normal form ER diagram and views may be modelled by ER diagrams. We develop a theory within the framework of the ER approach that characterizes
歌曲
发表于 2025-3-30 00:37:20
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Override
发表于 2025-3-30 07:13:28
Alexandra Wake,Drew Ambrose,Damian Grenfell on an object-oriented data model, where three levels of objects are distinguished: ., and .. We discuss the prerequisites for applying the query and update operations of an object algebra uniformly on all three levels. As a sample application of the framework, we focus on database evolution, that i