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What is the use of External Id in Salesforce?
I have seen a Java Application which is making callouts to Salesforce. While making callouts it uses external Id field which gets populated as soon as record gets created in salesforce.
SalesforceConnector.patchPatientInSalesforce("/services/data/v20.0/sobjects/Contact/SQL_External_Id__c/" + ws.getPatientId(),contactObject.toString());
where contactObject.toString() is the JSON format of the record.
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