Question at position 53 A referential integrity constraint specifies that the existence of an attribute in one table depends upon the existence of a foreign key in the same or another table.TrueFalse

Question

BlackTom AI · Accepted Answer

The question concerns what a referential integrity constraint enforces in relational databases.
Option 1: True. A referential integrity constraint ensures that a value in a foreign key column must correspond to an existing candidate key (typically the primary key) in the referenced table. This means the existence of a row (and its key value) in the referenced table is required for the foreign key reference to be valid, aligning with the idea that the existence of an attribute in one table depends upon the existence of a foreign key in the same or another table.
Option 2: False. This would be incorrect because the essence of referential integrity is precisely about maintaining valid references between tables via foreign keys; it is not accurate to claim that the constraint has no such dependence or that it applies only in a way unrelated to foreign keys. In addition, while some systems allow NULLs in a foreign key column, the core requirement for non-null foreign keys is that the referenced key must exist, which contradicts the assertion in this option.

Question at position 53 A referential integrity constraint specifies that the existence of an attribute in one table depends upon the existence of a foreign key in the same or another table.TrueFalse

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