Annotation Based Query Answer over Inconsistent Database |
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| Authors: | Ai-Hua Wu Zi-Jing Tan Wei Wang |
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| Affiliation: | Department of Computer Science and Engineering, Fudan University, Shanghai 200433, China
School of Computer Science, Shanghai Maritime University, Shanghai 200135, China |
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| Abstract: | In this paper, we introduce a concept of Annotation Based Query Answer, and a method for its computation, which can answer queries on relational databases that may violate a set of functional dependencies. In this approach, inconsistency is viewed as a property of data and described with annotations. To be more precise, every piece of data in a relation can have zero or more annotations with it and annotations are propagated along with queries from the source to the output. With annotations, inconsistent da... |
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| Keywords: | uncertain data data quality consistent query answer integrity constraints data cleaning |
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