Compatible attributes in a universal relation

C. Beeri, H. F. Korth
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引用次数: 27

Abstract

The problem of entities that play multiple roles in a relational database is studied, with an emphasis on the universal relation view of the database. A tree structure is used to describe the compatibilities among attributes. The compatibility information for an attribute encodes role playing information that cannot be described by traditional data dependencies. This structure is used to define the semantics of a QUEL-like (Stonebraker et al. [1976]) query language that uses special naming rules to permit easy use of attribute compatibility
通用关系中的兼容属性
研究了关系数据库中具有多重角色的实体问题,重点讨论了数据库的通用关系视图。采用树形结构描述属性间的兼容性。属性的兼容性信息对传统数据依赖关系无法描述的角色扮演信息进行编码。这种结构用于定义类似quel (Stonebraker et al.[1976])的查询语言的语义,该语言使用特殊的命名规则来方便地使用属性兼容性
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