Question at position 32 Requiring a CustomerID to exist in a Primary table before it can exist in a foreign table is an example of:the Hoffer Principle.referential integrity.key constraints.referential referring.

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The question presents a concept where a value must exist in a primary table before it can appear in a related foreign table. This is a hallmark of maintaining data consistency across related tables.
Option 1: 'the Hoffer Principle.' This term is not a standard or widely recognized principle in relational databases for enforcing cross-table consistency, so it is not a valid label for this concept.
Option 2: 'referential integrity.' This describes the constraint that ensures foreign keys correspond to primary keys in the related table, preventing invalid references and preserving data validity across tables. The scenario given directly illustrates this principle.
Option 3: 'key constraints.' While key constraints (like primary keys and unique keys) enforce uniqueness and identity within a single table, they do not by themselves enforce the existence of a parent row before a child row is created in another table. Referential integrity is the broader mechanism that coordinates foreign keys with primary keys across tables.
Option 4: 'referential referring.' This phrase does not correspond to any standard database concept and appears to be a non-technical or informal construction, making it an inappropriate label for the described mechanism.
In summary, the described requirement aligns with referential integrity, which governs the validity of links between tables via foreign keys and primary keys, ensuring that references are always to existing, valid records.

Question at position 32 Requiring a CustomerID to exist in a Primary table before it can exist in a foreign table is an example of:the Hoffer Principle.referential integrity.key constraints.referential referring.

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