The paper introduced the basic conception of math of relation database model, N-ple relation, fordered N-ple and fordered sets.
给出了关系数据库模型的数学基本概念，如N元关系、N元有序组及N元有序组集合。
The paper introduced the basic conception of math of relation database model, N-ple relation, fordered N-ple and fordered sets.
给出了关系数据库模型的数学基本概念，如N元关系、N元有序组及N元有序组集合。
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