CODEWITHSUNDEEP
databaseentity-relationshiprdbms
Pegasus008
Pegasus008

Reputation: 561

ISA relationship ER diagram

I want to add different type of departments to an entity called department in a ER diagram.Can I use ISA relationship for it.there are more than 2 departments.does ISA relationship can have more than 2 subclasses?

Upvotes: 1

Views: 4141

Answers (1)

reaanb
reaanb

Reputation: 10084

A supertype can have any number of subtypes. However, it's only useful to define subtypes if they'll have their own attributes or relationships. If not, a type attribute is sufficient.

Upvotes: 2

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