{"title":"On First-Order Query Rewriting for Incomplete Database Histories","authors":"V. Bruyère, Alexandre Decan, J. Wijsen","doi":"10.1109/TIME.2009.17","DOIUrl":null,"url":null,"abstract":"Multiwords are defined as words in which single symbols can be replaced by nonempty sets of symbols. Such a set of symbols captures uncertainty about the exact symbol. Words are obtained from multiwords by selecting a single symbol from every set. A pattern is certain in a multiword W if it occurs in every word that can be obtained from W. For a given pattern, we are interested in finding a logic formula that recognizes the multiwords in which that pattern is certain. This problem can be seen as a special case of consistent query answering (CQA).We show how our results can be applied in CQA on database histories under primary key constraints.","PeriodicalId":163298,"journal":{"name":"2009 16th International Symposium on Temporal Representation and Reasoning","volume":"216 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2009-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"7","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2009 16th International Symposium on Temporal Representation and Reasoning","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/TIME.2009.17","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 7
Abstract
Multiwords are defined as words in which single symbols can be replaced by nonempty sets of symbols. Such a set of symbols captures uncertainty about the exact symbol. Words are obtained from multiwords by selecting a single symbol from every set. A pattern is certain in a multiword W if it occurs in every word that can be obtained from W. For a given pattern, we are interested in finding a logic formula that recognizes the multiwords in which that pattern is certain. This problem can be seen as a special case of consistent query answering (CQA).We show how our results can be applied in CQA on database histories under primary key constraints.