主要提出描述国家信息基础结构的数学模型和多维信息的类库管理方法。
Main depicted mathematical modul of national information infrastructure and class base management system of multidimensional information.
给出了中介关系数据模型,在此基础上构造了两类不同的中介关系数据库查询语言:中介关系演算和中介关系代数。
Based on this model, this paper constructs two different kinds of medium relational database query languages: medium relational calculus and medium relational algebra.
在聚类和非一致性数据库无聚集查询基础上提出聚集查询重写方法。
This paper presents the rewriting method for aggregation queries based on clusters and non-aggregation queries in inconsistent databases.
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