Question

What is a Surrogate Key in the dimensional model, and how is it used?

a.

A primary key in a fact table; becomes a foreign key in a dimension table

b.

An artificial key field in a dimension table; usually with system-assigned sequential numbers; used to link a dimension table to the fact table

c.

A primary key in a dimension table; becomes a foreign key in a fact table

d.

An artificial key field in a fact table; used to link a fact table to a dimension table

Posted under Data Warehousing and OLAP

Answer: (b).An artificial key field in a dimension table; usually with system-assigned sequential numbers; used to link a dimension table to the fact table Explanation:A Surrogate Key in the dimensional model is an artificial key field, usually with system-assigned sequential numbers, used in the dimensional model to link a dimension table to the fact table. In a dimension table, the surrogate key is the primary key which becomes a foreign key in the fact table.

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