Script to find who has changed the sysadmin Password

The below script helps us to find the user_name who has changed the sysadmin password

SELECT substr(d.user_name,1,30) || '~'||substr(f.user_name,1,10)||'~'||substr(d.last_update_date,1,10) key,count(*) value
from apps.fnd_user d, apps.fnd_user f
WHERE
trunc(d.last_update_date) = trunc(sysdate)
and d.user_name='SYSADMIN'
and d.last_updated_by=f.user_id GROUP BY substr(d.user_name,1,30) || '~'||
substr(f.user_name,1,10)||'~'||substr(d.last_update_date,1,10);