Beeri, C. and Milo, T. Functional and predicative programming in OODBs, Proc. ACM PODS, San Diego, June 1992, pp 176-190. Home/Search Document Not in Database Summary Related Articles Check |
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Investigation of Algebraic Query Optimisation for Database .. - Poulovassilis, Small (1994) (2 citations) (Correct)
....of type fag and returns the union of the results. Notice that setmap f is just OE f ( fg. Bre91] similarly gives a finite set version of setmap defined in terms of Phi. Two functions that frequently appear in algebras are map : a b) fag fbg and f ilter : a Bool) fag fag e.g. in [Clu92, Bee92]. These functions generalise relational projection and selection. Although they could be built in for efficiency purposes, map and f ilter can be defined in terms of setmap as follows, where singleton f x = ff xg: filter f s = setmap (x.if (f x) fxg fg) s map f s = setmap (singleton f ) s A ....
Beeri, C. and Milo, T. Functional and predicative programming in OODBs, Proc. ACM PODS, 1992.
Algebraic Query Optimisation for Database Programming Languages - Poulovassilis, Small (1996) (3 citations) (Correct)
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Beeri, C. and Milo, T. Functional and predicative programming in OODBs, Proc. ACM PODS, San Diego, June 1992, pp 176-190.
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