What is slowely changing dimensions?why we are used SCD?
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Answer Posted / 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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