Ah, the SCD Type 2 Loader, the bread and butter of any data integration professional. Option A is definitely the way to go. Anything else would be like trying to herd cats with a feather duster.
I'm not sure about this one. I thought the SCD Type 2 Loader was more about handling slowly changing dimensions, not finding non-standard values. Options C and D seem a bit off.
Option A seems like the right choice. The SCD Type 2 Loader is all about tracking changes in data, and the business key is the way to identify unique records.
Myra
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