Saturday, March 15, 2008

What are slowly changing dimensions?

7 comments:

Tanya said...

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

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