Titlebook: Relational Database Technology; Suad Alagi? Book 1986 Springer-Verlag New York Inc. 1986 Processing.data model.database.modeling.optimizat

Cleveland

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書目名稱Relational Database Technology網(wǎng)絡(luò)公開度




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STENT

健談

Logical Design,l entities including those which are in fact relationships. It requires little justification. In fact, we already showed that the hierarchical (unnormalized) model exhibits the insertion, deletion, and update anomalies. The reason is precisely the fact that more than one entity was represented by a

寬宏大量

Data Integrity, constraints are specified during the logical design phase and are in fact a part of the model. Various general types of integrity constraints discussed so far have to do with functional dependencies and keys, multivalued dependencies, aggregation, generalization, and so on. In addition, there are m

Sad570

逗它小傻瓜

使無效

https://doi.org/10.1007/978-1-4612-4922-1Processing; data model; database; modeling; optimization; programming; relational database

granite

Introduction,Concepts, techniques, and tools of the technology that is the topic of this book are meant to be applied in a diversity of environments. In such an application environment, a diversity of users and their information needs are the reason for introducing the relational technology in the environment to satisfy those needs in the best possible way.

Cpr951

Data Model,A model is a representation of a set of objects and their relationships. Such a representation is always the result of a process of abstraction. During that process relevant objects, relevant relationships among them, and relevant attributes of both objects and relationships are chosen.

Clumsy