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    政大機構典藏 > 理學院 > 資訊科學系 > 期刊論文 >  Item 140.119/69384
    Please use this identifier to cite or link to this item: http://nccur.lib.nccu.edu.tw/handle/140.119/69384

    Title: An exploration of relationships among exclusive disjunctive data
    Authors: 陳良弼
    Chiu,Jui-Shang;Chen,Arbee L.P.
    Contributors: 資科系
    Keywords: Incomplete information;disjunctive information;partial values;query language semantics;tuple relationships;relational databases
    Date: 1995-12
    Issue Date: 2014-08-28 10:15:18 (UTC+8)
    Abstract: We elaborate on how to interpret the query answer on exclusive disjunctive databases and how to reduce the query answer into a more concise form. Exclusive disjunctive data are represented as a pair of value set and variable set in Pv-table which is an extension of the relational model. A value set corresponds to a finite set of possible values in which exactly one value is the true value. By variable sets, tuples may be related with certain relationships, namely disjunctive relationship and join relationship. Three kinds of tuple sets are classified according to these relationships, each possesses an important property, namely co-exist, co-nonempty, or co-instance. Based on these properties, the interpretation of Pv-tables can be formalized in a semantically meaningful way, Also, the redundant and mergeable tuples can be identified. After removing and merging tuples accordingly, a more concise Pv-table can thus provide a better understanding of the query result
    Relation: IEEE Transactions on Knowledge and Data Engineering (EI,SCI),928-940
    Data Type: article
    Appears in Collections:[資訊科學系] 期刊論文

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