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Ignore field in Account Load on Upsert

Is there a way to ignore a field in a row on upsert? For example, I have the fax field on Account_Load and when I have a value in my table I want it to update the record in salesforce if it is populated in Account_Load. If I have no value (or NULL) in Account_Load, I want it to skip the overwrite (Update) of the field in the Account table in salesforce.
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