Data exchange and incomplete information

    Symposium on Principles of Database Systems, pp. 60-69, 2006.

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    certain answerstarget instancestandard certain answers semanticsaccount incomplete informationnull valuesMore(12+)

    Abstract:

    Data exchange is the problem of finding an instance of a target schema, given an instance of a source schema and a specification of the relationship between the source and the target, and answering queries over target instances in a way that is semantically consistent with the information in the source. Theoretical foundations of data exc...More

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