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Data & Analytics · Advanced

SCD Type 3

A slowly changing dimension method that adds a column to store the previous value alongside the current one, keeping limited history.

Definition

Type 3 supports 'before and after' comparisons, such as an old and new sales territory, but tracks only one prior value.

Example

Columns CurrentRegion and PreviousRegion.

Exam tip

Type 3 = a new column holding the prior value only.

Related terms