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Sven Hartmann     Uwe Leck

Matrix representations of participation constraints

University of Rostock, Institute of Mathematics, 2003

https://doi.org/10.18453/rosdok_id00005907

Abstract: We discuss the existence of matrix representations for generalized and minimum participation constraints which are frequently used in database design and conceptual modelling. Matrix representations, also known as Armstrong relations, have been studied in literature e.g. for functional dependencies and play an important role in example-based design and for the implication problem of database constraints. The major tool to achieve the results in this paper is a theorem of Hajnal and Szemerédi on the occurrence of clique graphs in a given graph.

working paper   free access