Try this
delimiter //
CREATE TRIGGER j_update BEFORE UPDATE ON d
FOR EACH ROW
BEGIN
IF 1=1 THEN
INSERT INTO d (
stampOld, stampNew
)
VALUES (
OLD.stamp, NEW.stamp
);
END IF;
END; //
delimiter ;
Here is one I just tried on my mysql but its for update almost same with your logic
mysql> delimiter //
mysql> create trigger tbl_two_ins
-> after insert on tabletwo
-> for each row
-> begin
-> if 1=1 then
-> update tableone t1 set t1.tb2_id = new.tab2_id where t1.tb1_id = new.tb1_id ;
-> end if ;
-> end ; //
Query OK, 0 rows affected (0.56 sec)
mysql> delimiter ;