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• W2016282341 abstract "Recently, much attention has been paid to query languages for nested relations. In the present paper, we consider the nested algebra and the powerset algebra, and compare them both mutually as well as to the traditional flat algebra. We show that either nest or difference can be removed as a primitive operator in the powerset algebra. While the redundancy of the nest operator might have been expected, the same cannot be said of the difference. Basically, this result shows that the presence of one nonmonotonic operator suffices in the powerset algebra. As an interesting consequence of this result, the nested algebra without the difference remains complete in the sense of Bancilhon and Paredaens. Finally, we show there are both similarities and fundamental differences between the expressiveness of query languages for nested relations and that of their counterparts for flat relations." @default.
• W2016282341 created "2016-06-24" @default.
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• W2016282341 creator A5019309676 @default.
• W2016282341 date "1991-09-01" @default.
• W2016282341 modified "2023-09-28" @default.
• W2016282341 title "A comparison between algebraic query languages for flat and nested databases" @default.
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• W2016282341 doi "https://doi.org/10.1016/0304-3975(91)90327-x" @default.
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