Authors: James B. Behm, Toby J. Teorey
Tags: 1993, conceptual modeling
Practical extensions to the Entity-Relationship (ER) model to support inter-entity constraints, referred to as relative constraints, are described and analyzed. Relative constraints are business model integrity constraints and rules captured in the business analysis. They specify existence and value relations among predicates. The constraints are specified in a proposed declarative language based on First Order Logic. They can then be translated into the relational algebra and SQL.Read the full paper here: https://link.springer.com/chapter/10.1007/BFb0024356
