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The family of conditional generalized embedded dependencies about relations in relational databases is introduced. These constraints are expressible as formulas in second-order logic and they are cons...tructed with generalized embedded dependencies as the components. For a class of this family a characterisation of a given constraint logically implied by a certain subclass of the class is given. The existence of the Armstrong-like databases for special classes of conditional generalized embedded dependencies is proved. A method for the construction of an Armstrong model, when it exists and certain conditions are fulfilled, is given.show more
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