Question

Why are primary keys in a data warehouse different from those in operational systems?

a.

They are longer in length

b.

They are stored in a separate database

c.

They cannot have built-in meanings

d.

They are generated automatically

Posted under Data Warehousing and OLAP

Answer: (c).They cannot have built-in meanings Explanation:Primary keys in a data warehouse cannot have built-in meanings, as opposed to operational systems.

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Q. Why are primary keys in a data warehouse different from those in operational systems?

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