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Grefen, P.W.P.J. and P.M.G. Apers, Integrity control in relational database systems -An overview, Data & Knowledge Engineering 10 (1993) 187-223. This paper gives an overview of research regarding integrity control or integrity constraint handling in relational database management systems. The topic of constraint handling is discussed from two points of view. First, constraint handling is discussed by identifying a number of important research issues, and by treating each issue in detail.doi:10.1016/0169-023x(93)90008-d fatcat:5jnsitez4fbfnhsgoqsfepc56y