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Fetch empty text value of type external id using SOQL query in apex. I am using this query :

Select id,name,CommentBody__c,CommentId__c,ParentId__c 
from Case_Comment__c 
where ParentId__c =:caseObj.id

Where CommentId__c is external id type field.

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If you are checking those values in the debug or creating a JSON then those null values will be ignored.

You can create a wrapper to check those null values in the apex or can even use the null check.

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