Primary and foreign keys are the only pieces of information in a relational database table that should be duplicated.

Name: Primary and foreign keys are the only pieces of information in a relational database table that should be duplicated.
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Primary and foreign keys are used to establish relationships between tables in a relational database. They are the only pieces of information that should be duplicated because they are used to ensure data integrity and consistency.

Primary and Foreign Keys Are the Only Pieces of Information