SELECT * FROM PL_REQUEST_DOC WHERE REQ_CODE ='0002/2020/TTr-0630007'

SELECT * FROM PL_REQUEST_PROCESS WHERE REQ_ID =(SELECT REQ_ID FROM PL_REQUEST_DOC WHERE REQ_CODE ='0002/2020/TTr-0630007')
SELECT * FROM PL_REQUEST_PROCESS_CHILD WHERE REQ_ID =(SELECT REQ_ID FROM PL_REQUEST_DOC WHERE REQ_CODE ='0002/2020/TTr-0630007')