```
Create or replace Trigger in_vehicle
Before Insert of PURCHASE_DATE On Vehicle 
for each row
Begin
IF(:new.PURCHASE_DATE < '12/31/2016')
THEN
raise_application_error(20001, 'the Hire date must be between 2017 and 2020');
end if 
if(:new.PURCHASE_DATE > '12/31/2016') and  (:new.PURCHASE_DATE > '01/01/2020')
then raise_application_error(20001, 'the Hire date must be between 2017 and 2020');
end if;
end;

```

ORA-04073: column list not valid for this trigger type