Activity › Forums › Salesforce® Discussions › What are external Ids? Does external ids are unique in salesforce? › Reply To: What are external Ids? Does external ids are unique in salesforce?
MemberAugust 14, 2020 at 1:32 pm
An external ID is a custom field that has the External ID attribute, meaning that it contains unique record identifiers from a system outside of Salesforce. When you select this option, the Data Import Wizard detects existing records in Salesforce with external IDs that match those values in the import file.