在Oracle中，以下是STUDENTS表的结构： SID NUMBER NOT NULL，Primary Key SNAME VARCHAR2(30) COURSE_ID VARCHAR2(10) NOT NULL MARKS NUMBER 你需要查询参加了课程ID为C10的考试，并且分数排在前10名的学生，以下（ ）语句能够实现此功能。SELECT SID,marks,ROWNUM "Rank" FORM students
A.WHERE ROWNUM<=10 AND course_id=.C10. ORDER BY marks DESC;SELECT SID,marks,ROWNUM"Rank" FORM students
B.WHERE ROWNUM<=10 AND course_id=.C10. ORDER BY marks;SELECT SID,marks,ROWNUM"Rank" FORM (SELECT SID ,marks FORM students
C.WHERE ROWNUM<=10 AND course_id=.C10.) ORDER BY marks DESC;SELECT SID,marks,ROWNUM"Rank" FORM (SELECT SID ,marks FORM students
D.WHERE course_id=.C10. ORDER BY marks DESC) WHERE ROWNUM<=10;
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