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- W2949812463 abstract "The annotation of the results of database transformations was shown to be very effective for various applications. Until recently, most works in this context focused on positive query languages. The provenance semirings is a particular approach that was proven effective for these languages, and it was shown that when propagating provenance with semirings, the expected equivalence axioms of the corresponding query languages are satisfied. There have been several attempts to extend the framework to account for relational algebra queries with difference. We show here that these suggestions fail to satisfy some expected equivalence axioms (that in particular hold for queries on standard set and bag databases). Interestingly, we show that this is not a pitfall of these particular attempts, but rather every such attempt is bound to fail in satisfying these axioms, for some semirings. Finally, we show particular semirings for which an extension for supporting difference is (im)possible." @default.
- W2949812463 created "2019-06-27" @default.
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- W2949812463 date "2011-05-11" @default.
- W2949812463 modified "2023-09-26" @default.
- W2949812463 title "On the Limitations of Provenance for Queries With Difference" @default.
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