Sorry for the links I'm new! I'm confused on the difference between one and one and only one and where they would be used. I just started the class so I apologize if my diagram is wrong as well.
1 Answers
Maybe too late, but I think this is good answer for you from Wiki: "The inner component of the notation represents the minimum, and the outer component represents the maximum"
And more visualize: https://www.vertabelo.com/blog/crow-s-foot-notation/
So in your case: "Any patient who is admitted must have exactly one admitting physician" need an One and only one relationship. I think your diagram is alright. Keep going on
Related