Oracle Trigger Error, pls help...

From: <kickerchua_at_audiophile.com>
Date: Fri, 14 Aug 1998 18:26:56 GMT
Message-ID: <6r1vhg$5pv$1@nnrp1.dejanews.com>

hi all, i have been trying to build this trigger on my Personal Oracle 8 but it gives me a compilation error, anybody knows where did i do it wrong?

all i wanted to do is to halt any booking on those rooms that has been already booked. and
give the guest_name (the person who book the room) and the date when a booking can be made.

thanks for your time. pls reply to me via email to mailto:choonkeng_at_yahoo.com , thanks in advance.

---

create trigger booked before insert on booking for each row

declare
been_booked exception;

guest_name           varchar(20);
last_date         date;

begin
	if ( select guest_no
             from booking
     	     where room_no = :new.room_no and
          	   hotel_no = :new.hotel_no ) is not null
	then raise been_booked;
	end if;


	exception
		when been_booked then
		(select name into guest_name
		from guest
		where guest_no =
		      ( select guest_no
 			from booking
			where room_no = :new.room_no and
 			      hotel_no = :new.hotel_no );
		select date_to+1 into last_date
		from booking
		where room_no = :new.room_no and
		      hotel_no = :new.hotel_no;

 		raise_application_error (-00027, 'You cannot book this room
because it
		had been booked by ' || guest_name'. You can book this room by

' || to_char (last_date)'.');)
end;

---

PLS-00103: Encountered the symbol "SELECT" when expecting one of the following:

   ( - + mod not null others <an identifier>
<a double-quoted delimited-identifier> <a bind variable> avg
   count current exists max min prior sql stddev sum variance    cast <a string literal with character set specification>
<a number> <a single-quoted SQL string>
PLS-00103: Encountered the symbol "NOT" when expecting one of the following:

   ) intersect minus union

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