DROP TRIGGER IF EXISTS `AutoInsert`;
CREATE DEFINER=`root`@`localhost` TRIGGER `AutoInsert` AFTER INSERT ON `ml_exam` FOR EACH ROW 
begin 
	DECLARE var_KAOHAO VARCHAR(50); 
	DECLARE var_KAOSHIHAO VARCHAR(50); 
	DECLARE var_count INT; 
	DECLARE STUDENT_CURSOR CURSOR FOR (SELECT KAOHAO FROM `ML_STUDENT`); 
	SET var_KAOSHIHAO = NEW.KAOSHIHAO; 
	SELECT COUNT(*) INTO var_count FROM `ML_STUDENT`; 
	OPEN STUDENT_CURSOR; 
	WHILE var_count>0 DO 
	FETCH STUDENT_CURSOR INTO var_KAOHAO; 
	INSERT INTO ML_SCORE(KAOHAO,KAOSHIHAO) VALUES(var_KAOHAO,var_KAOSHIHAO); 
	SET var_count = var_count -1; 
	END WHILE; 
	CLOSE STUDENT_CURSOR; 
end;
 

1.所有的 變數的宣告一定要在最前面，不能在後面宣告，否則會報錯

2. 這裡使用了while迴圈來多次插入