Question : According to ____________________ integrity, the values appearing in the given attributes of any tuple in the referencing relation must also appear in the defined attributes of at least one tuple in the referred relation.
Option 1: Referential
Option 2: Primary
Option 3: Referencing
Option 4: Specific
Correct Answer: Referential
Solution : Think of the two relations r1 and r2. The primary key of relation r2 may be one of the qualities of r1 as well. With reference to r2, this characteristic is known as a foreign key from r1. Foreign key dependence relation r1 is also known as the referencing relation, while foreign key dependency relation r2 is known as the referenced relation.
Hence the correct answer is option 1.