update USR
set usr_pwd_warn_date=null, usr_pwd_expire_date=null, usr_pwd_never_expires='1'
where usr_login='XELSYSADM';
commit;
(OR)
update USR
set usr_pwd_warn_date=null, usr_pwd_expire_date='01-04-21', usr_pwd_never_expires='1'
where usr_login='XELSYSADM';
commit;
NOTE :
Date : dd/MM/yy