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I created a custom object and want to upload data. I have to insert data based upon the 3 unique fields .If all the three unique fields have unique values the it should create a new record, Othwerwise it should overide the existing record.

I created a custom object and want to upload data using DataLoader. I have to insert data based upon the 3 unique fields .If all the three unique fields have unique values then it should create a new record, Othwerwise it should overide the existing record.

How do I do this?

Thank you.