What is slowely changing dimensions?why we are used SCD?
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Answer / navneet singh sahni
Slowely Changing Dimensions are those whose data are not
fixed.
SCD types:
SCD type 1: Whose data is not fixed. Historical data are
not saved. Data keeps on changing.-> Current Data
SCD type 2: Whose data is fixed and also save historical
data.
SCD type 3: like SCD type 2 only but save hostorical data
in another table. In one table data will updated and in
another table historical data will be there.
Depends what we are going to use a DWH or Database.
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Answer / nasa
these are three types
type-1
type-2
type-3
type-1: it will not maintain historical data... that means
if you update the record it store but it will remove
previous data
type-2: type -2 maintain historical data. it store new data
by row wise..
type-3: type-3 also maintain historical data but it stores
data column wise and it allow limited nearly 250
but type allow more that 250 so type-2 is the best...
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