Constraints of E-R Modeling
September 17, 2016
Categorised in: Database Management System
An E-R enterprise schema may define certain constraints to which the contents of a database system must conform.
- Mapping Cardinalities
- One to one
- One to many
- Many to one
- Many to many
- Participation Constraints
- Total participation: If every entity in E participation is at least one relationship in R.
- Partial participation: If only some entities in E participate in relationships in R.