Imagine these different cases when designing a database:
One book (only one instance of a title physically) can be borrowed by many people, but only one person at once but many people during a time period.
Multiple instances of the same book physically (same title) can be borrowed by many people at the same time (obviously) in the one and same library only as before.
Would these two cases produce the same result when designing a relational schema?
If someone comes up with a better title for this question I will gratefully accept a change.