学生表:S(,姓名,性别)和选课成绩表:SC(,课程号,成绩),用SQL语言检索选修课程在5门以上(含5门)的学生的、姓名和平均成绩,并按平均成绩降序排序,正确的命令是______。
A.
SELECT S.,姓名,AVG(成绩) 平均成绩 FROM S,SC; WHERE \r\nS.=SC.; GROUP BY S.,姓名 HAVING COUNT(*)> =5 ORDER BY 3 \r\nDESC
B.
SELECT S.,姓名,AVG(成绩) FROM S,SC; WHERE S.=SC. AND \r\nCOUNT(*)> =5; GROUP BY ,姓名 ORDER BY 3 DESC
C.
SELECT S.,姓名,AVG(成绩) 平均成绩 FROM S,SC; WHERE S.=SC. \r\nAND COUNT(*)> =5; GROUP BY S.,姓名 ORDER BY 平均成绩 DESC
D.
D.SELECT S.,姓名,平均成绩 FROM S,SC; WHERE \r\nS.=S; GROUP BY S.,姓名 HAVING COUNT(*)> =5 ORDER BY 平均成绩 \r\nDESC