I am looking for help/feedback on an entity relationship diagram for a video rental store. My database is currently set up with four tables: users, customers, movies, and rentals. I am struggling a bit with the cardinalities between the table and am looking for some advice/suggestions. Some background info: I created a prototype IS for a small movie rental store. It is a very simple IS that can store employee(user),, customer, and movie information as well as hypothetically complete a rental transaction. Again, a very simplified prototype.

customers users PK id PK id first name rentals first name ast name PK id last name address phone FK customerid phone email FK movieid email use mame FK userid birthdate adm in movies PK id title main actor year genre