Discussion
When a foreign key column is created without a corresponding foreign key constraint, we have created a "casual relationship" between the two tables.
Answer: A
Correct answer: True
A casual relationship is one implied by the data but not declared to the DBMS: the foreign key column is present and the application relies on it, but no constraint enforces the reference. Nothing then prevents an orphaned value, and the integrity depends entirely on every program getting it right.
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