publication . Article . 2008

Nest and Unnest Operators in Nested Relations

Georgia Garani;
Open Access English
  • Published: 01 May 2008 Journal: Data Science Journal (issn: 1683-1470, eissn: 1683-1470, Copyright policy)
  • Publisher: Ubiquity Press
Abstract
By distinguishing nested attributes as Decomposable and Non-Decomposable, it is proved that for all nested relations, unnesting and then renesting on the same attribute yields the original relation subject only to the elimination of duplicate data. Therefore, the statement that was popular in nested relations research: "Unnesting and then nesting on the same attribute of a nested relation does not always yield the original relation" is reconsidered.
Subjects
free text keywords: Science (General), Q1-390, Nested relation, Non-First Normal Form database, Decomposable nested attribute, Non-First Normal Form database; Nested relation; Decomposable nested attribute
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publication . Article . 2008

Nest and Unnest Operators in Nested Relations

Georgia Garani;