CREATE OR REPLACE TRIGGER nsdlgroup  
BEFORE UPDATE ON UPD_GRP    
FOR EACH ROW
WHEN (NEW.ID <> OLD.ID)
CALL MY_PROCEDURE(:NEW.ID, :OLD.ID)

CREATE OR REPLACE TRIGGER nsdlgroup  
BEFORE UPDATE ON UPD_GRP    
FOR EACH ROW
BEGIN
IF UPDATING('ID') THEN
      if (:NEW.ID <> :OLD.ID) then
      CALL MY_PROCEDURE(:NEW.ID, :OLD.ID)
      end if;
END IF;

IF UPDATING('NAME') THEN
      if (:NEW.NAME <> :OLD.NAME) then 
      CALL MY_PROCEDURE(:NEW.NAME, :OLD.NAME)
      end if;
END IF;
END;

CREATE OR REPLACE TRIGGER nsdlgroup  
BEFORE UPDATE ON UPD_GRP    
FOR EACH ROW
WHEN (NEW.ID <> OLD.ID or NEW.NAME <> OLD.NAME)
BEGIN
  if (:NEW.ID <> :OLD.ID) then
     MY_PROCEDURE(:NEW.ID, :OLD.ID)
  end if;
  if (:NEW.NAME <> :OLD.NAME) then 
     MY_PROCEDURE(:NEW.NAME, :OLD.NAME)
  END IF;
END;

create or replace procedure MY_PROCEDUTE(x in varchar2,y varchar2)
is
begin
if (substr(x,1,1) <> substr(y,1,1)) then
insert into audit_table values (substr(y,1,1),substr(x,1,1));
end if;
if ( substr(x,2,1) <> substr(y,2,1)) then
insert into audit_tablevalues (substr(y,2,1),substr(x,2,1),);
end if;
if ( substr(x,3,1) <> substr(y,3,1)) then
insert into audit_table values (substr(y,3,1),substr(x,3,1);
end if;
if ( substr(x,4,1) <> substr(y,4,1)) then
insert into audit_table values (substr(y,4,1),substr(x,4,1);
end if;
if ( substr(x,5,1) <> substr(y,5,1)) then
insert into audit_table values (substr(y,5,1),substr(x,5,1);
end if;
if ( substr(x,6,1) <> substr(y,6,1)) then
insert into audit_table values (substr(y,6,1),substr(x,6,1);
end if;
if ( substr(x,7,1) <> substr(y,7,1)) then
insert into audit_table values (substr(y,7,1),substr(x,7,1);
end if;
if ( substr(x,8,1) <> substr(y,8,1)) then
insert into audit_table values (substr(y,8,1),substr(x,8,1);
end if;
end;

Error report:
SQL Error: ORA-04098: trigger 'SYSTEM.NSDLGROUP' is invalid and failed re-validation
04098. 00000 -  "trigger '%s.%s' is invalid and failed re-validation"
*Cause:    A trigger was attempted to be retrieved for execution and was found to be invalid.  This also means that compilation/authorization failed for the trigger.
*Action:   Options are to resolve the compilation/authorization errors, disable the trigger, or drop the trigger.

if ( substr(x,2,1) <> substr(y,2,1)) then
insert into audit_tablevalues (substr(y,2,1),substr(x,2,1),);
end if;

if ( substr(x,2,1) <> substr(y,2,1)) then
insert into audit_table values (100,'insert','dmatfunction',substr(y,2,1),substr(x,2,1));
end if;