Oracle PL/SQL - Exemple après INSERT Trigger

CREATE TABLE USER_DETAILS
(
    USER_ID number(10) primary key,
    USER_NAME varchar2(15),
    EMAIL varchar2(20),
    PHONE number(12),
    PASSPORT_NO varchar2(10),
    DRIVING_LICENSE_NO varchar2(10)
);

CREATE TABLE USER_REMINDERS
(
    USER_ID number(10),
    REMINDER_TEXT varchar2(200),
    REMINDER_DATE date,
    STATUS varchar2(10)
);

CREATE OR REPLACE TRIGGER trg_after_insert_user
AFTER INSERT
  on USER_DETAILS
  FOR EACH ROW

DECLARE
counter number(2);
reminder_text varchar2(200);

BEGIN
counter := 0;
reminder_text := '';

  IF(:NEW.PASSPORT_NO = '' OR :NEW.PASSPORT_NO is null) THEN
    reminder_text := 'Please insert your passport details into system. ';
    counter := counter+1;
  END IF;

  IF(:NEW.DRIVING_LICENSE_NO = '' OR :NEW.DRIVING_LICENSE_NO is null) THEN
    reminder_text := reminder_text || 'Please insert your Driving license details into system.';
    counter := counter+1;
  END IF;

  -- If passport_no and/or driving_license_no is missing
  -- then counter will be >0 and below code will insert into user_reminders table.
  IF(counter>0) THEN
    INSERT INTO USER_REMINDERS VALUES (:NEW.USER_ID,reminder_text,sysdate+3,'PENDING');
  END IF;

END;

-- fire after insert trigger, no action.
INSERT INTO USER_DETAILS VALUES (1,'USERNM1','[email protected]',9999999999,'PASSNUM123','DRIVLIC999');

-- fire after insert trigger, password is null, insert new record into USER_REMINDERS
INSERT INTO USER_DETAILS VALUES (2,'USERNM22','[email protected]',1111111111,null,'LICNC12345');

-- fire after insert trigger, password and driving no are null, insert new record into USER_REMINDERS
INSERT INTO USER_DETAILS VALUES (3,'USERNM33','[email protected]',3333333333,null,null);

-- fire after insert trigger, driving no is null, insert new record into USER_REMINDERS
INSERT INTO USER_DETAILS VALUES (4,'USERNM44','[email protected]',4444444444,'ONLYPASS11',null);

select * from USER_DETAILS;

select * from USER_REMINDERS;