Question

How do Type 3 changes enable tracking forward and backward?

a.

By deleting old values

b.

By creating new dimension tables

c.

By using effective date ranges

d.

By preserving both old and new values

Posted under Data Warehousing and OLAP

Answer: (d).By preserving both old and new values Explanation:Type 3 changes enable tracking forward and backward by preserving both old and new values of changed attributes.

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Q. How do Type 3 changes enable tracking forward and backward?

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