Philosopher AI
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Consider: Relational Data Model
I think that if a relational data model is considered to be abstract in its nature, then it has no relation to anything. It is the state of being empty because by definition there are no relationships present. In this sense, such an entity does not exist.
However, if a relational data model is considered to be concrete in nature then it relates to many things. This entity has relations with all the other entities that exist.