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QUERYING FUZZY MULTIDIMENSIONAL DATABASES: UNARY OPERATORS AND THEIR PROPERTIES

机译:查询模糊多维数据库:一元运算符及其性质

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摘要

In this paper, we study the properties of flexible queries in the OLAP (On-Line Analytical Processing) framework, focusing on unary operators. For this purpose, we consider the model we have defined for fuzzy multidimensional databases. This model provides means to handle fuzzy data and flexible queries. The operators defined in this model are closed on the set of fuzzy hypercubes (hereafter cubes), which means that the result of each operator on a fuzzy cube is a cube. Thus, these operators can be nested into expressions. In this paper, the combination of several queries is investigated in order to study the possibility for the definition of an algebra to manipulate fuzzy cubes. This would provide a framework for query rewriting and, as a result, for query optimization.
机译:在本文中,我们研究了OLAP(在线分析处理)框架中的灵活查询的属性,重点是一元运算符。为此,我们考虑为模糊多维数据库定义的模型。该模型提供了处理模糊数据和灵活查询的方法。该模型中定义的算子在模糊超立方体(以下称立方体)的集合上是封闭的,这意味着每个模糊立方体上的算子的结果都是一个立方体。因此,这些运算符可以嵌套在表达式中。在本文中,研究了几个查询的组合,以研究定义代数来处理模糊立方体的可能性。这将为查询重写提供一个框架,从而为查询优化提供一个框架。

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