which field stores value for Primary for national_identifiers

Summary:

which field stores value for Primary for national_identifiers

Content (required):

For National Identifiers in Front end,we can enter more than 1 National Identifier but can make only 1 National Identifier as Primary.

Eg: For India colleagues,we can have Aadhar and PAN as national identifiers but can have only PAN as Primary.

The question is the table per_national_identifiers does not store a field to store this Primary field.

How do we retrieve this information from table or view and where is this information stored?

Version (include the version you are using, if applicable):

21d

Code Snippet (add any code snippets that support your topic, if applicable):