单选题
检索选修4门以上课程的学生总成绩(不统计不及格的课程)，并要求按总成绩的降序排列出来。正确的SELECT语句是
Ａ) SELECT S#，SUM(GRADE)FROM SC
WHEREGRADE＞=60
CROUP BY S#
ORDER BY 2 DESC
HAVING COUNT(*)＞=4
Ｂ) SELECT S#，SUM(GRADE)FROM SC
WHERE GRADE＞=60
GROUP BY S#
HAVING COUNT(*)＞=4
ORDER BY 2 DESC
Ｃ) SELECT S#，SUM(GRADE)FROM SC
WHERE GRADE＞=60
HAVINC COUNT(*)＞=4
GROUP BY S#
ORDER BY 2 DESC
Ｄ) DELECT S#，SUM(GRADE)FROM SC
WHERE GRADE＞=60
ORDER BY 2 DESC
CROUP BY S#
HAVINC COUNT(*)＞=4