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.
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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
nobody
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As it’s currently written, your answer is unclear. Please [edit] to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers [in the help center](/help/how-to-answer). – Community May 12 '22 at 07:22
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I have done a bit of research and it seems like there is no difference between them however as computer scientists we like to make things clear and unambiguous - thus double dash was introduced.
Essentially double dash removes ambiguity but means the same thing!
Bekhruz Suleymanov
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