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What is SCD1 , SCD2 , SCD3?
SCD Stands for Slowly changing dimensions.
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.
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