我想查询计算机成绩低于95的学生信息，可是总显示错误，有没有大神帮我改一下？万分感谢????????????????

select stu.*, sco.C_name as C_name, sco.Grade as Grade
from student stu, score sco
where stu.Id = sco.Stu_id
and sco.Grade < 95 and stu.Department = '计算机';

select * from student,score where student.id = score.Stu_id and score.C_name = '计算机' and score.Grade < 95