Triggers in Oracle DB

CREATE TABLE "PVTEST" 
( "PVNAME" VARCHAR2(20 BYTE)
) ;


CREATE TABLE "PVLOG" 
( "PVSUMMARY" VARCHAR2(20 BYTE)
) ;


CREATE OR REPLACE TRIGGER PVTEST_TRIGGER
  BEFORE DELETE OR INSERT OR UPDATE ON PVTEST
  FOR EACH ROW

BEGIN
  insert into PVLOG (PVSUMMARY) values ('pippo');
END;

With this trigger, and modification will generate an extra entry in the PVLOG table.

Now I want to distinguish the operation being done:

CREATE OR REPLACE TRIGGER PVTEST_TRIGGER
  BEFORE DELETE OR INSERT OR UPDATE ON PVTEST
  FOR EACH ROW

BEGIN
  IF DELETING then
    insert into PVLOG (PVSUMMARY) values ('DELETING');
  END IF; 
  IF INSERTING  then
    insert into PVLOG (PVSUMMARY) values ('INSERTING');
  END IF; 
  IF UPDATING  then
    insert into PVLOG (PVSUMMARY) values ('UPDATING ');
  END IF; 
  
END;
/

in the case of an UPDATE, you have the 2 variables :OLD and :NEW pointing to the old and new record.

The real pity is that there doesn't seem to be a way to declare a trigger for ANY table in the schema, and retrieving the table being affected with a :TABLE variable. You can define SCHEMA TRIGGERS, but they cannot be defined to catch INSERT DELETE UPDATE events.