Storing a relationship in a database that could otherwise be derived from two independent relationships through a join operation can cause data modification operations to perform slower,but has no effect on modification anomalies.

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Quizplus · Accepted Answer

Storing such a relationship can indeed cause data modification anomalies, as it introduces redundancy, which can lead to inconsistencies during updates, inserts, or deletes if not carefully managed.

Storing a Relationship in a Database That Could Otherwise Be