Please use this identifier to cite or link to this item: http://hdl.handle.net/1880/46310
Title: EXTENDED RELATIONAL ALGEBRA FOR REDUCTION OF NATURAL QUANTIFIER COOL EXPRESSIONS
Authors: Bradley, James
Keywords: Computer Science
Issue Date: 1-May-1994
Abstract: An extended relational algebra has been developed. This extended algebra is suitable for reduction of expressions written in the object-oriented natural quantifier language COOL. The algebra consists of conventional operations plus a group select, a subgroup select and possibility join operation. The group select operation selects each group of related tuples where a quantity of the group obeys a condition. The subgroup select operation selects each group of related tuples where a quantity of a subgroup of the group obeys a condition. The possibility join of relation R1 with relation R2 regenerates relation R1 but with each tuple having a logical attribute p concatenated, with p true where the R1 tupple could have been joined to an R2 tuple, otherwise p false. Generalized algebra routines for generalized COOL expressions are presented.
URI: http://hdl.handle.net/1880/46310
Appears in Collections:Bradley, James

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