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Duplicate tuples are not allowed in a relation to maintain the integrity and uniqueness of the data. Each tuple in a relational database represents a unique record, and allowing duplicates could lead to ambiguity and inconsistency in data retrieval and updates. Enforcing uniqueness helps ensure that each entry can be distinctly identified, which is essential for effective data management and querying. Additionally, it aligns with the mathematical foundation of relations in set theory, where a set cannot contain duplicate elements.
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