关于从数据库模式派生外部模式的功能

F. Saltor
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引用次数: 4

摘要

任何数据模型的一个重要方面是从数据库模式派生外部模式的能力。以系统的方式使用和扩展ERA元模型,将从数据库模式到外部模式的转换分为四个类,每个类都有许多子类。对于特定的数据模型,确定哪些外部模式的类和子类可以在该模型中派生,可以衡量其在这方面的能力。该方法应用于具有视图和null的基本关系模型,以及具有Parent & spacapietra的“Burgundy代数”的完整基本实体关系模型。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
On the power to derive external schemata from the database schema
An important aspect of any data model is the power to derive external schemata from the Database schema. Using and extended ERA metamodel in a systematic way, transformations from the Database schema into external schemata are classified in four classes, each classes having a number of subclasses. Determining for a specific data model which of these classes and subclasses of external schemata may be derived in that model, one gets a measure of its power in this respect. This method is applied to the basic relational model with views and nulls, and to the full basic Entity Relationship model with the "Burgundy algebra" of Parent & Spaccapietra.
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