雄伟
发表于 2025-3-25 05:25:02
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带来
发表于 2025-3-25 07:47:35
Extending the entity-relationship model for a high-level, theory-based database design,tabase to a high-performance database schema in the model of the corresponding DBMS. Since the late 1970‘s, various methodologies for database design have been introduced. Most of them, however, are dependent on the knowledge, comprehension and experience of the database analyst and their knowledge
Alpha-Cells
发表于 2025-3-25 14:44:47
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几何学家
发表于 2025-3-25 19:35:10
Modelling inheritance in a strongly typed functional model,tion. There seems to be a rather general consensus that the object-oriented data models fall within the class of procedural (non-declarative) data models. This is primarily due to the fact that the essential features of OO data models have been derived from the background of OO programming, while de
Encephalitis
发表于 2025-3-25 21:00:42
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甜瓜
发表于 2025-3-26 01:57:37
Controlled generation of intensional answers,tabase. This paper motivates the concept of intensional answers and introduces a general method for generating them as logical consequences of the query and of deduction rules. It then shows how integrity constraints can filter out inadequate answers and produce simpler and more informative answers.
Contort
发表于 2025-3-26 06:59:05
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沙发
发表于 2025-3-26 08:32:42
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Rheumatologist
发表于 2025-3-26 14:30:34
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细胞学
发表于 2025-3-26 17:52:24
Toward multiparadigm database interfaces,nted. In addition to the relational facilities the environment supports object type hierarchies based on type extensions. The related inclusion polymorphism applies also to object identifiers permitting a high degree of flexibility in defining and manipulating complex objects. The degree of polymorp