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Question

Why do dimension tables often use surrogate keys?

a.

To maintain built-in meanings in the keys

b.

To simplify query performance

c.

To eliminate the need for operational system keys

d.

To avoid issues related to operational key changes and reassignments

Posted under Data Warehousing and OLAP

Answer: (d).To avoid issues related to operational key changes and reassignments Explanation:Dimension tables often use surrogate keys to avoid issues related to operational key changes and reassignments.

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