用游标查询出所有记录，用游标逐一判断，查找出工资为300整除并且名字长度大于4个字符的员工信息； 显示输出员工编号，姓名和工资
DECLARE
myrow emp%ROWTYPE;
CURSOR mycur IS SELECT * FROM emp WHERE MOD(myrow.sal,300)=0 AND length(myrow.ename)>4;
BEGIN
OPEN mycur;
FETCH mycur INTO myrow;
WHILE mycur%FOUND
LOOP
dbms_output.put_line('员工编号：'||myrow.empno||'姓名：'||myrow.ename||'工资：'||myrow.sal);
FETCH mycur INTO myrow;
END LOOP;
CLOSE mycur;
COMMIT;
END;
麻烦大神给看下，我刚开始学游标，这样写运行不出来，不知道是怎么回事？谢谢了
