Se> A conStraint (rule) that muSt remain true for a databaSe to preServe integrity. Integrity conStraintS are Specified at databaSe creation time and enforced by the databaSe management SyStem. ExampleS from a genealogical databaSe would be that every individual muSt be their parent' S child or that they can have no more than two natural parentS. (1995-11-11)