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A key-preserved table is one where every key in a foreign key relationship is also present in the parent table, ensuring that the relationship can be maintained without ambiguity. In contrast, a non-key-preserved table may contain foreign keys that do not correspond to any primary keys in the referenced table, which can lead to orphaned records. This distinction is important for maintaining referential integrity in relational databases. Key-preserved tables typically allow for easier joins and data integrity, while non-key-preserved tables may require additional handling in queries.

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