意外报错的出发器

show triggers;
drop trigger pyb_tk_exam_subject_set
delimiter
////////此方法是错误的，刚刚插入的当前行，不能用update会造成死循环
////////操作其它表，用update ，操作当前表用 before set
create trigger pyb_tk_exam_subject_set after update on pyb_tk_exam_subject for each row
begin
　　if (NEW.child_num > 0 and NEW.score > 0) then
　　　　update pyb_tk_exam_subject set totalscore = child_num * score where ID = NEW.ID;
　　end if;
end;
////////此方法是错误的，刚刚插入的当前行，不能用update会造成死循环，请修改 注意： ===before
////////此方法是错误的，刚刚插入的当前行，不能用update会造成死循环，请修改 注意： ===before
////////此方法是错误的，刚刚插入的当前行，不能用update会造成死循环，请修改 注意： ===before
create trigger pyb_tk_exam_subject_set before update on pyb_tk_exam_subject for each row
begin
　　if (NEW.child_num > 0 and NEW.score > 0) then
　　　　set NEW.totalscore=NEW.child_num * NEW.score;
　　end if;
end;

//////例子二
create trigger pyb_tk_exam_test_record_set before update on pyb_tk_exam_test_record for each row
begin
　　if (NEW.eid >0) then
　　　　set NEW.topid=(select topid from pyb_tk_exam_test where pyb_tk_exam_test.id=NEW.eid);
　　　　set NEW.fid=(select fid from pyb_tk_exam_test where pyb_tk_exam_test.id=NEW.eid);
　　　　set NEW.cid=(select cid from pyb_tk_exam_test where pyb_tk_exam_test.id=NEW.eid);
　　end if;
end;