If Referential Data Integrity is enforced and Cascade Delete Related Fields is active, then what happens if the primary key, that this constraint is related to, is deleted?

Question

BlackTom AI · Accepted Answer

Let’s unpack the scenario described in the question, focusing on referential integrity and cascade delete behavior when the primary key is removed.
Question restated: If Referential Data Integrity is enforced and Cascade Delete Related Fields is active, what happens when the primary key that this constraint references is deleted?
Answer options:
- None of the choices listed are correct.
- The record with this foreign key connected to the primary key in this specific constraint is deleted.
- Nothing changes.
- The foreign key connected to the primary key in this specific constraint is updated.

Now, evaluate each option one by one:
Option 1: None of the choices listed are correct. This would be true only if none of the other options describe the actual cascade behavior. Since cascade delete is active, we usually expect related records to be removed, so this option will generally be false in systems honoring cascade deletes.
Option 2: The record with this foreign key connected to the primary key in this specific constraint is deleted. This aligns with cascade delete semantics: when a primary key row is deleted, all dependent foreign key rows that reference that key are automatically deleted to maintain referential integrity. This description matches the expected outcome.
Option 3: Nothing changes. This would imply that deleting the primary key has no effect on related records, which contradicts the purpose of cascade delete and referential integrity rules that enforce automatic action on dependent rows. Therefore, this option is incorrect.
Option 4: The foreign key connected to the primary key in this specific constraint is updated. Cascading deletes typically remove dependent rows rather than just updating foreign key values; update-on-delete behavior (like setting null or changing the key) is a different cascade option (e.g., cascade update or set-null) that is not described here. Given that the scenario specifies cascade delete, this option does not match the described behavior and is incorrect.

In summary, option 2 most accurately reflects cascade delete behavior: deleting the referenced primary key triggers deletion of the related records that hold the foreign key value pointing to it, thereby preserving data integrity. The other options either contradict the concept of cascade delete or misrepresent how referential-action rules operate under this setting.

If Referential Data Integrity is enforced and Cascade Delete Related Fields is active, then what happens if the primary key, that this constraint is related to, is deleted?单项选择题

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