检索选修四门以上课程的学生总成绩,并要求按总成绩的降序排列出来。正确的SELECT语句是()。

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检索选修四门以上课程的学生总成绩,并要求按总成绩的降序排列出来。正确的SELECT语句是()。

A.SELECT SNO, SUM(GRADE)FROM SC GROUP BY SNO ORDER BY 2 DESC HAVING COUNT(*)>= 4;

B.SELECT SNO, SUM(GRADE)FROM SC GROUP BY SNO HAVING COUNT(*)>=4 ORDER BY 2 DESC;

C.SELECT SNO, SUM(GRADE)FROM SC HAVING COUNT(*)>=4 GROUP BY SNO ORDER BY 2 DESC;

D.SELECT SNO, SUM(GRADE)FROM SC ORDER BY 2 DESC GROUP BY SNO HAVING COUNT(*)>=4;

参考答案:

答案:SELECT SNO, SUM(GRADE)FROM SC GROUP BY SNO HAVING COUNT(*)>=4 ORDER BY 2 DESC;