An integrity constraint for a fuzzy relational database

The authors formally define fuzzy multivalued dependencies on a chosen fuzzy database model. Since functional dependencies have already been extended for fuzzy database models earlier, they only deal with an important integrity constraint, namely multivalued dependencies (MVDs), for the fuzzy relational database introduced by B.P. Buckles and F.E. Petry (1982, 1985). It is shown that the fuzzy MVDs (FMVDs) are consistent and reduce to the classic MVDs when they involve precise attribute values. Some examples are given to show how the integrity constraints imposed by the FMVDs are forced whenever a tuple is to be inserted or to be modified