IF上的MySQL触发错误

Question

这是我的SQL，但MySQL服务器一直说它在SQL语法中有错误。我已经尝试了很多次，但它不起作用。请帮助！

DELIMITER //
CREATE TRIGGER Score_Count_for_Contestant
AFTER INSERT ON award
FOR EACH ROW
BEGIN
 IF NEW.award = 'gold'AND contestant.CID=new.CID THEN
  UPDATE contestant SET contestant.score= contestant.score+10

IF new.Award='silver' AND contestant.CID=new.CID THEN
   UPDATE contestant SET contestant.score= contestant.score+8

IF new.Award='bronze' AND contestant.CID=new.CID THEN
   UPDATE contestant SET contestant.score= contestant.score+6
 END IF
END //

DELIMITER ;