External ID in Salesforce

What is External ID in Salesforce - The Definitive Guide

In this blog, we will discuss the External ID in Salesforce. So, An External ID is a custom field that has the External ID attribute, which means that it contains unique record identifiers from a system outside of Salesforce. 

The maximum number of external IDs an object may have in Salesforce is around up to 25 External ID fields per object. 

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The types of fields which can be used as an external IDs in Salesforce are only custom fields with data type text, numbers, or email as external IDs. 

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Now let’s understand some important points to consider before working with external IDs: 

  • An External ID field contains record IDs from systems outside Salesforce. 
  • We can only use the upsert call to match against the External ID fields during import or integration in the org. 
  • The values in this external ID field must also be unique and we can also determine whether or not values are case-sensitive. 
  • Custom fields marked as unique also count against an object limit of external id fields. 
  • When a field is marked as external Id, the field will be automatically indexed, so selective filters on them should be run quickly. 

What is the Use of External ID in Salesforce:

  • It becomes searchable in the sidebar search. 
  • Salesforce record ID is not required to load data. 
  • It can be used with UPSERT DML operation to integrate with other systems. 
  • The data import wizard detects existing records in Salesforce with external IDs that match those values in the import file. 

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To Create a Field and Set it as an External ID field: 

Step 1: Go to setup and select Object Manager and then select any object. 

Step 2: Now go to the custom field and relationship section and click New. 

Step 3: In the Data type list, select a data type for the field. 

Step 4: Enter the details for the field and select the field label, length, Field Name, and Description. 

Step 5: Check the External ID box, and click Next. Set the field-level security and then click next and then save. 

The field marked as external ID is created. Now we can use that field as an external ID. 

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