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- W33084057 abstract "We argue that a multirelation (relation with duplicates) is not, a semantically independent data object, but rather it should be viewed as a subset. of columns within a larger relation that has no duplicates. Consequently, at the level of the conceptual database, duplicates in base relations or in views are not allowed, nor are operations on multirelations. Multirelations as query output can be specified by designating a subset of some relation’s columns for output, while “hiding” the rest, of the columns. Similarly, aggregate functions are applied to multirelations by applying them to a column within a relation. Our approach can be applied to extend any query language in a consistent way to have full multirelational expressiveness, and such an extension for the query language QUEL is detailed." @default.
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- W33084057 date "1998-01-01" @default.
- W33084057 modified "2023-09-26" @default.
- W33084057 title "Multirelations - Semantics and Languages" @default.
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