Activity › Forums › Salesforce® Discussions › What is an external ID in Salesforce? Which all field data types can be used as external IDs? › Reply To: What is an external ID in Salesforce? Which all field data types can be used as external IDs?
MemberMarch 14, 2018 at 3:32 pm
External id is a unique record identifiers from a system outside of Salesforce. While importing data by data import wizard it can figure out duplicate records by the help of their external Id's.
Exploring the same :
If any application that have data of employees (like empId, name,designation etc.) is now linking with Salesforce so when they both linked together and application's data imported to Salesforce so at that time the empId of employees in existing application is considered as an external Id for Salesforce.
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