Existence
An entity is said to be existence-dependent if it can exist in the database only when it is associated with another related entity occurrence.
What results from the union of three entities?
- A three-way association is known as a ternary relationship.
- When binary relationships are unable to adequately capture the semantics of the association, this kind of relationship is necessary.
- A single diamond is the symbol for the ternary relationship construct, which connects three entities.
Is it dependent on existence and does its parent's primary key component appear in its primary key?
- An entity is existence-dependent in terms of implementation if it has a required primary key.
- If the primary key of the associated entity has at least one primary key component of the parent object, there is a weak relationship.
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