The Power of Upsert and External IDsHow To: Salesforce Data Loader

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CSV file of accounts to import

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TLS 1.0 Disablement – Upgrade Data Loader to v36.0 or later

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Accounts created or updated by upsert matching on external id field

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CSV file of contact records to import.Rather than specify Salesforce account ids, specify their external ids.

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Contacts created or updated by upsert matching on external id field