Constraints Mapping Cardinalities Express the number of entities to which another entity can be associated via a relationship set. Most useful in describing binary relationship sets For a binary relationship set the mapping cardinality must be one of the following types: One to one One to many Many to one Many to many Database System Concepts 2.10 OSilberschatz. Korth and SudarshanDatabase System Concepts 2.10 ©Silberschatz, Korth and Sudarshan Constraints Mapping Cardinalities Express the number of entities to which another entity can be associated via a relationship set. Most useful in describing binary relationship sets. For a binary relationship set the mapping cardinality must be one of the following types: One to one One to many Many to one Many to many