How to check the custom field as External ID and Unique field using apex class

its achievable with the help of DescribeFieldResults on each Salesforce Objects, below is the sample code for your reference:

Schema.DescribeFieldResult Acc = Account.Account_Number__c.getDescribe();
System.debug(Acc.isExternalID());  // true
System.debug(Acc.isUnique());      // true
System.debug(Acc.isIdLookup());    // true

There are three Unique/External ID fields per object defaults, if you want more then we can increase upto Seven External ID Fields with the help of Salesforce Support team.


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I am Sakthivel Madesh, a certified Salesforce Advanced Developer & Administrator working on Salesforce Technology since 2011. I am currently working in Techforce Services as Sr. Salesforce Developer. I have worked on multiple technologies Like PHP, Java, Salesforce, I am very passionate about Salesforce and to earn 15x Salesforce Certification. I love Trailhead for learning Salesforce Skill and Become a Trailhead 6x Ranger too. I Love to Learn & Share my Salesforce knowledge to Salesforce Learners/Beginner using My Blog and Salesforce Community.

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