PL/SQL create trigger /Thanks in advance : Create a trigger called biufer_customer that starts before insert or update of the column passwd in the customer table. The trigger shall verify that the password is exactly six characters long, no more, no less. Unless this requirement is fulfilled, the trigger shall stop the transaction and confirm that this error occurred.

    create or replace trigger biufer_customer
    before insert or update 
    of passwd
    on customer
    for each row
    when (new.passwd <> 6)
    begin
	    raise_application_error(-20001,'Wrong password!');
    end;
    /
