CREATE OR REPLACE TRIGGER LOG_KLIENCI_TRIGGER
  AFTER INSERT OR UPDATE OR DELETE
  ON KLIENCI
DECLARE
  log_action  LOGI.CZYNNOSC%TYPE;
BEGIN
  IF INSERTING THEN
    log_action := 'Insert';
  ELSIF UPDATING THEN
    log_action := 'Update';
  ELSIF DELETING THEN
    log_action := 'Delete';
  ELSE
    DBMS_OUTPUT.PUT_LINE('This code is not reachable.');
  END IF;

  INSERT INTO LOGI (NAZWA_TABELII, CZYNNOSC, DATA_ZMIANY)
    VALUES ('KLIENCI', log_action, SYSDATE);
END;
/
ALTER TRIGGER "LOG_KLIENCI_TRIGGER" ENABLE;