My team and I are designing a database for a barber shop. The main focus of the project is to allow customers to schedule appointments with barbers for some sort of hair service.
Our problem is that our professor is telling us to connect two relationships to each other and when we ask why he doesn't really do a good job of explaining why they need to connect. We told our professor that the book forbids the connection of two relationships to each other but he said "the book is wrong". The two relationships that our professor wants us to connect are performs to includes. My team and I think it would be better to connect performs to appointment. Does anyone understand why we would connect those two relationships to each other?