\(
\def\T#1{\bf #1}
\def\A#1{\bf #1}
\def\K#1{\underline{\bf #1}}
\)
Modelling the domain
What is your design?
Rel-ship $\Rightarrow$ relation
Combining many-one relations
Handling weak entity sets
Attribute vs Entity
When to promote an attr. to an entity?
Ambiguity / missing “logic”
One needs changing!
Which to change?
Rel-ship vs Entity
When to promote a rel-ship to an entity?