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Select this option when you want to remove duplicates from your source data. You will be able to define the field(s) that you want Dataimporter to look at, when considering whether records are duplicates or not:
By selecting multiple fields, Dataimporter will check both columns, and only when both columns match, will records be considered duplicates.
Dataimporter will always perform an exact match when looking at removing duplicates e.g. 'Acme Account' and 'acme account' will not be considered duplicates.