Following SQLs commands can be used to replace the content of the column using new values rather than writing new scripts to update values.
SELECT pdf_location,
REPLACE(pdf_location, '/2026/08/', '/2026/09/') AS new_pdf_location
FROM cib_pdf_bill
WHERE pdf_location LIKE '/c01/cipdf/2026/08/%' and account_no = '33700503';
UPDATE cib_pdf_bill
SET pdf_location = REPLACE(pdf_location, '/2026/25/', '/2026/08/')
WHERE pdf_location LIKE '/c01/cipdf/2026/25/%' and account_no = '33700503';