It signifies total participation of Movie in Acts_In. Also known as existence dependency.
ER Diagram : Understanding connections between relationship and entities
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02-07-2022 - |
Вопрос
I am trying to understand this diagram and after reading over PowerPoints and the Book I still don't see an answer to my question.
What is the difference between the single line and the double line connecting the relationship to the entities? Thank you.
Решение
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