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• W2113595874 abstract "Algebraic database languages for nested relations use two operators, NEST and UNNEST, which change the nesting levels of relations. Consider a first-normal form relation scheme R and a sequence SEQ of NEST and UNNEST operators on R, with the last operator being an UNNEST on attribute Y. SEQ is single-nest-reversible if, for all instances r of R, the relation instance that preceded UNNEST is obtained, if SEQ(r) is nested on attribute Y. In the present work, the authors give (1) a necessary and sufficient condition that decides whether SEQ is single-nest-reversible or not; (2) the algorithm TEST to check the condition in (1) in O(n/sup 8/) time where n is the length of SEQ; and (3) sound and complete axioms for functional dependencies in one-level nested relations. >" @default.
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• W2113595874 date "2002-12-04" @default.
• W2113595874 modified "2023-10-17" @default.
• W2113595874 title "Detecting when UNNEST after a sequence of NESTs and UNNESTs can always be reversed with a single NEST" @default.
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• W2113595874 doi "https://doi.org/10.1109/hicss.1990.205198" @default.
• W2113595874 hasPublicationYear "2002" @default.
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