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upsert attachment from command line

Hi Guys,


Is there any way I could upsert the attachment from command line data loader? 


My understanding is that extenal id is the key for upserting, but you cannot create a extenal id for attachment. So there is no way to upsert attachment ? Am I right?


Thanks in advance 




Best Answer chosen by Admin (Salesforce Developers) 



There is no external ID field defined on Attachment object. The ID field will be used for matching.

So there is no way to upsert attachment.


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