U.S. PATENT NUMBER 5,675,779
Data processing system and method for maintaining cardinality in a relational database
- Effective Filing Date: May 21, 1990
- Patent Issue Date: October 7, 1997
Cardinality definition and enforcement (e.g., One-to-One, Many-to-One, One-to-Many, Many-to-Many).
The Prior Art required software developers to develop code to handle their application’s specific cardinality requirements. This locked their code to a specific data model design inside hand coded programs.
Many commercial systems are required to check cardinality in one form or another and prefer the data base management system to handle these requirements for them.