Database : what design to point on two possibilities?

Question

I am designing a datamodel for a new project.

One of the requirements specifies that some objects can point either a person or a company.

What is the sma

Answer 1

I suggest you make company and person subtypes that reference the same supertype (actor). Note that you don't need separate person_id, company_id because an actor must be one or other and cannot be both. Like this: