An objective of this task is to create a conceptual schema of a sample data warehouse

domain described below. Read and analyse the following specification of a data

warehouse domain.

A person is represented as either a patient or a medical worker or an administration

worker. Medical and administration workers work in medical facilities that have a name,

address, and possibly $($not obligatory$)$ specialization. Each medical worker is described

as a unique staff number at a facility, name, address, and phone number.