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Data loader to update relationships.

Hi, Experts - I got account and contact records into a sandbox and saved old ID values as in external / legacy fields for both objects. Question: using data loader how can I go about re-establish relations between account and contact utilizing external / legacy fields ? I did not want to work with csv files - thought data loader or any other API way I could do this ....help is appreciated, thank you.
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Updating the records using external/legacy ids With Dataloader, you have to go for Upsert instead of update.




IF we have a Junction object in the legacy system which is usually set of two foreign keys and they both together make up the primary key, how would I set up the external id in the salesforce and successfully use upsert functionality?