Answer / pranay

scd2: slowly changing dimension 2

SCD2 is used to maintain both current data and historical
data.
for ex: If we are having following data
cid cname city country
101 raju hyderabad India

if we want to implement scd2 for the above data we need to
create target table with columns

scid cname city country flag version date
scid - surrogate key column

and if the customer moves from hyderabad to delhi then the
output will be

scid cname city country flag version
1 raju hyderabad India 0 1
2 raju delhi India 1 2

Flag = 0 defines historical data
Flag = 1 defines current data

Similarly if again raju moves from delhi to mumbai the the
output will be

scid cname city country flag version
1 raju hyderabad India 0 1
2 raju delhi India 0 2
2 raju mumbai India 1 3
n so on..

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