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    题名: Refining imprecise data by integrity constraints
    作者: 陳良弼
    Tseng,Frank S.C.;Chen,Arbee L.P.;Yang,Wei-Pang
    贡献者: 資科系
    关键词: Imprecise data;partial values;refinement;referential integrity;functional dependency;multivalued dependency;multidatabase systems
    日期: 1993-12
    上传时间: 2014-08-28 10:15:36 (UTC+8)
    摘要: Uncertain data in databases were originally denoted as null values, which represent the meaning of ‘values unknown at present.” Null values were generalized into partial values, which correspond to a set of possible values, to provide a more powerful notion. In this paper, we derive some properties to refine partial values into more informative ones. In some cases, they can even be refined into definite values. Such a refinement is possible when there exist range constraint on attribute domains, or referential integrities, functional dependencies, or multivalued dependencies among attributes.Our work actually eliminates redundant elements in a partial value. By this process, we not only provide a more concise and informative answer to users, but also speedup the computation of queries issued afterward. Besides, it reduces the communication cost when imprecise data are requested to be transmitted from one site to another site in a distributed environment.
    關聯: Data & Knowledge Engineering,11(3),299-316
    数据类型: article
    显示于类别:[資訊科學系] 期刊論文

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