英文:
What's the relationship between metadata and data model?
问题
元数据是否可以视为数据模型的实例？在关系型数据库管理系统中，外键是数据模型的一部分，外键的规范可以视为元数据的一种。但我没有找到关于“是实例关系”的普遍性证据，表明这两个概念之间存在这种关系。此外，我已经参考了一些教材，如《数据库系统概念》和《数据库系统基础》。
英文:
Is is appropriate to consider metadata as the instance of data model?
I am sure that in relational DBMS, foreign key is part of its data model, and the specification of foreign key is kind of metadata. But I found no evidence that is instance of relationship is universal between these 2 concepts.
BTW, I've already refered some text books like Database System Concepts and Fundamentals of Database Systems.
答案1
得分: 1
元数据是表示数据模型的数据。一个例子是伴随大多数数据库系统中的模式的数据字典。以这种方式表达模型的优点是可以在元数据上使用与用于检查数据的相同查询语言。
英文:
Metadata is data that expresses a data model. An example is the data dictionary that accompanies the schema in most database systems. The advantage of this way of expressing a model is that the same query language that is used to examine the data can be used on the metadata.
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