Person External Identifier information can be deleted easily using HDL. Under Worker use ExternalIdentifier to delete this data.
Run the below query to extract required data in HDL format:
SELECT 'METADATA|ExternalIdentifier|ExternalIdentifierId|PersonId' HEADER, 1 DATA_ROW
FROM DUAL
UNION
SELECT 'DELETE|ExternalIdentifier|'
||peai.EXT_IDENTIFIER_ID
||'|'||peai.PERSON_ID DATAR, 2 DATA_ROW
FROM PER_EXT_APP_IDENTIFIERS peai
,PER_ALL_PEOPLE_F papf
WHERE peai.person_id = papf.person_id
AND TRUNC(SYSDATE) BETWEEN papf.effective_start_date AND papf.effective_end_date
AND papf.person_number IN ('11','12')
Sample HDL File:
METADATA|ExternalIdentifier|ExternalIdentifierId|PersonId
DELETE|ExternalIdentifier|300000247194865|300000066997395