Computer Science ›› 2016, Vol. 43 ›› Issue (1): 232-236, 241.doi: 10.11896/j.issn.1002-137X.2016.01.050

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Study on Data Repair and Consistency Query Processing

LIU Bo, CAI Mei and ZHOU Xu-chuan   

  • Online:2018-12-01 Published:2018-12-01

Abstract: There are usually query inconsistencies problems of disobeying data constraints in databases and integration systems.Repairing is one of the main approaches to tackle these problems,but few unified models have been studied based on repairing,constraints and queries at present.We proposed the consistency query algorithm based on deleting tuples and given constraints,which produces results being consistent with the constraints,and is suitable for query processing with the various kinds of data constraints (i.e.,not specific one).It defines the concise syntax for constraint expressions and query sentences.A new query and repair system model was built,which includes relational instances,a non-null constraint set,query definitions and repair methods,so that the query results satisfy the constraints.The me-thod,language syntax and model proposed in the paper are of universal and applicable properties,which are not limited to specific repair methods,constraints and queries.

Key words: Data repair,Consistency,Query model

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