A.
SELECT 课程名称,COUNT(成绩) AS 总分 FROM 课程,成绩 WHERE 课程.课程编号=成绩.课程编号 ORDER BY 成绩.课程编号
B.
SELECT 课程名称,COUNT(成绩) AS 总分 FROM 课程,成绩 WHERE 课程.课程编号=成绩.课程编号 GROUP BY 成绩.课程编号
C.
SELECT 课程名称,SUM(成绩) AS 总分 FROM 课程,成绩 WHERE 课程.课程编号=成绩.课程编号 ORDER BY 成绩.课程编号
D.
SELECT 课程名称,SUM(成绩) AS 总分 FROM 课程,成绩 WHERE 课程.课程编号=成绩.课程编号 GROUP BY 成绩.课程编号