Discussion
If a relationship has a cascade updates constraint, then if ________ in the parent table is changed, then the same change will automatically be made to any corresponding foreign key value.
Answer: A
Correct answer: the primary key
Cascading updates propagate a change in the parent’s primary key to every foreign key value referring to it, so that the references stay valid. The provision is only needed where the primary key can change; a surrogate key never does, which is exactly why using one makes cascading updates unnecessary.
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