Question at position 7 Requiring a CustomerID to exist in a Primary table before it can exist in a foreign table is an example of:referential referring.referential integrity.the Hoffer Principle.key constraints.

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Question at position 7 Requiring a CustomerID to exist in a Primary table before it can exist in a foreign table is an example of:referential referring.referential integrity.the Hoffer Principle.key constraints.

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Question restatement: The prompt asks about a scenario where a CustomerID must exist in a primary table before it can exist in a foreign table, and you must identify which concept this illustrates.
Option 1: 'referential referring.' This wording is not a standard database term. It sounds like a mistaken conflation of 'referential' with some other phrase, but it does not describe an established concept in relational databases.
Option 2: 'referential integrity.' This option aligns with the fundamental rule that a foreign key value must match an existing primary key value in the related table, thereby ensuring valid references between tables. It enforces the dependency and consistency across relational tables.
Option 3: 'the Hoffer Principle.' There is no widely recognized database principle by this name in standard relational theory, so this option does not describe referential behavior between primary and foreign tables.
Option 4: 'key constraints.' While keys and constraints exist in databases, this term is generic and does not specifically capture the requirement that a foreign key must correspond to an existing primary key in the other table. It’s broader and less precise for this scenario.
Further distinction: The core idea of requiring a CustomerID in the foreign table to reference an existing entry in the primary table is exactly what referential integrity enforces. The remaining options either use nonstandard terminology or are too vague to describe the described mechanism.
Putting it together: Recognizing the specific mechanism of maintaining valid references across related tables points to referential integrity as the correct concept, while the other options fail to precisely capture that mechanism due to terminology gaps or generality.

Question at position 7 Requiring a CustomerID to exist in a Primary table before it can exist in a foreign table is an example of:referential referring.referential integrity.the Hoffer Principle.key constraints.

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