ITE 131 Database Systems Concept
Ass. Prof. Kowit Rapeepisarn, Ph.D.
The ER model concepts are sufficient for representing many
database schemas for traditional database applications, which
mainly include data-processing applications in business and
industry.
However, designers of database applications have tried to
design more accurate database schemas that reflect the data
properties and constrains more precisely
In this chapter, we describe features that have been proposed
for semantic data models, and show how the ER model can be
enhanced to include these concepts.