基于基本准环的求关系模式全部候选关键字方法

A Method to Find All Can■ate Keys of Relational Schema Based on Basic Cycle

摘要: 本文进一步讨论了有关分类的准环对应的关系模式的候选关键字的理论和定理,给出了相应的准环对应的关系模式以及基于基本准环求超图对应的关系模式的全部候选关键字的方法。

Abstract: In this paper,the theory and theorems of candidate keys of relational schema to which classified quasi-cycles corresponding are discussed.The methods to find candidate keys of relational chema to which quasi-cycles corresponding and to which hypergraph corresponding based on basic squasi-cycle are given.