Не работает IF....ELSE, или мой мозг

CREATE OR REPLACE FUNCTION temptable_create()
  RETURNS trigger AS
$BODY$
DECLARE _tname varchar(25);
	_date varchar(10);
	t_exist varchar;
	t_len integer;
	c_q varchar;
	i_q varchar;
	user_rec record;
BEGIN
	--user_rec = NULL;
	_date = to_char(to_timestamp(NEW.eventtimestamp), 'DDMMYYYY');
	_tname = 't' || substring(NEW.userid from 25 for 36) || '_' || _date;
	c_q = 'CREATE TABLE tmp.'|| _tname ||' (
		eventid character(36) NOT NULL, 
		userid character(36) NOT NULL, 
		userfio character(50) NOT NULL, 
		turniket character(10) NOT NULL, 
		prizn character(6) NOT NULL, 
		eventtimestamp integer NOT NULL);';
	i_q = 'INSERT INTO tmp.'|| _tname ||' (eventid, userid, userfio, turniket, prizn, eventtimestamp) values (
		''' || NEW.eventid || ''',
		''' || NEW.userid || ''',
		''' || NEW.userfio || ''',
		''' || NEW.turniket || ''',
		''' || NEW.prizn || ''',
		''' || NEW.eventtimestamp || ''');';
	-- Провереряем, создана ли таблица
	PERFORM * from pg_tables where tablename like ''||_tname||'';
	IF NOT FOUND THEN
		EXECUTE c_q;
	END IF;
	EXECUTE i_q;
	RETURN NEW;
END;
$BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100;
ALTER FUNCTION temptable_create()
  OWNER TO htoito;