Introduction

This document is an informal introduction to data modeling using the Entity-Relationship (ER) approach. It is intended for someone who is familiar with relational databases but who has no experience in data modeling. The basic techniques described are applicable to the development of microcomputer based relational database applications as well as those who use relational database servers such as MS SQL Server or Oracle.

The document is a practical guide, not an academic paper on either relational database design or data modeling. Readers interested in a rigorous treatment of these topics should consult the bibliography.