Introduction

An E-R diagram may need to be restructured before it can be translated into a relational database schema as it may present some problematic constructs.

Actually, translation rules may be devised for every E-R construct, but the suggested approach is to resolve these situations at E-R level, first, to proceed with simpler translation rules, later.

The problematic constructs are:

• derived attributes
• composite attributes
• multi-valued attributes
• generalizations/specialization

M3.02 E-R Restructuring