On The Satisfiability of Dependency Constraints in Entity-Relationship Schemata

@inproceedings{Lenzerini1987OnTS,
  title={On The Satisfiability of Dependency Constraints in Entity-Relationship Schemata},
  author={Maurizio Lenzerini and Paolo Nobili},
  booktitle={VLDB},
  year={1987}
}
The problem of satisfiability of a specific class of integrity constraints in data bases, namely the dependency constraints, is analysed. An Entity-Relationship model is used for expressing data schemata. In this model suitable types of dependency constraints, called cardinality ratio constraints, allow one to impose restrictions on the mappings between entities and relationships. We show that, as far as such a class of constraints is concerned, the usual notion of satisfiability is not… CONTINUE READING
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