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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.
6
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answers
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Should I generate external IDs when not needed to avoid potential query issues later?
I have a Currency Rate table with a few fields like so:
Currency_Definition__c : M-D(Currency Definition)
As_of__c : Date
FX_USD__c : Decimal
Key__c : String(11) ExternalId
This table gets updated … It will be unique as we upsert all records on that value, although at present the field is not declared unique, only ExternalId. …