I have a Dimension in my DW in which 4 columns together forms the business key ,so there is no single BK. To insert into the fact table (Staging area) i would need a FK, so should the fact table have the combination of these 4 columns (4 FK) for this specific Dimension or should I create a column "ID identity(1,1) Int" into the source table? Note: This is the staging area I am creating in SSIS, so I assume surrogate keys should only be inserted in DW.
Business key combination
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