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|Title:||Preservation of integrity constraints in definite DATALOG programs|
|Authors:||Wang, K. |
|Keywords:||Databases, deductive databases|
|Source:||Wang, K.,Yuan, L.Y. (1992-12-10). Preservation of integrity constraints in definite DATALOG programs. Information Processing Letters 44 (4) : 185-193. ScholarBank@NUS Repository.|
|Abstract:||Given a program P and two sets IC and IC′ of integrity constraints, IC uniformly implies IC′ in P if whenever an (input) database I defined on predicates of P satisfies IC then the (output) database computed by P from I satisfies IC′. P preserves IC if IC uniformly implies IC in P. We consider only definite DATALOG programs. We show that testing preservation of downward-closed integrity constraints can be simplified to the case of single-rule programs that are computed in a "nonrecursive manner". Specially, we present an efficient test algorithm when constraints are equality-generating dependencies. We also show that the uniform implication problem can be similarly simplified if IC is preserved and all given constraints are downward-closed. Our results generalize dependency-preserving database schemes by considering mappings defined by arbitrary definite DATALOG programs and more general integrity constraints. © 1992.|
|Source Title:||Information Processing Letters|
|Appears in Collections:||Staff Publications|
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