General Datawarehousing Interview Question:

Explain What are slowly changing dimensions?

Submitted by: Administrator

SCD stands for Slowly changing dimensions. Slowly changing dimensions are of three types

SCD1: only maintained updated values.

Ex: a customer address modified we update existing record with new address.

SCD2: maintaining historical information and current information by using

A) Effective Date

B) Versions

C) Flags

or combination of these

scd3: by adding new columns to target table we maintain historical information and current information
Submitted by: Administrator