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Answer Posted / aakanksha
Well its actually the concept of SCD (Slowly changing
deimension)which are of three types type1,type2,type3
Type1:-keeps the information about the current record and
no history is maintained it it.
Type2:-Keeps the proper historical information by including
a surrogate key or we can say a flag which will indicate or
point to the currwent information.
Type3:-Keeps the partial historical information we main
tain it by keeping or including two columns say start date
and end date but it si not that much helpful as compare to
the type 2 slowly changing dimension as type 2 provides
more information than type3 .
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