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用SQL语言检索选修课程在5门以上(含5门)的学生的学号、姓名和平均成绩,并按平均成绩降序排序,正确的命令是
A.
SELECTS.学号,姓名,平均成绩FROMS,SC; WHERES.学号=SC.学号; GROUP BY S.学号HAVING GOUNT(*)>=5 ORDER BY 平均成绩 DESC
B.
SELECT 学号,姓名,AVG(成绩)FROMS,SC; WHERE S.学号=SC.学号 AND COUNT(*)>=5; GROUP BY 学号 ORDER BY 3 DESC
C.
SELECT S.学号,姓名,AVG(成绩)平均成绩FROM S,SC; WHERE S.学号=SC.学号 AND COUNT(*)>=5; GROUP BY S.学号ORDER BY平均成绩DESC
D.
SELECT S.学号,姓名,AVG(成绩)平均成绩FROM S,SC; WHERE S.学号=SC.学号; GROUP BY S.学号 HAVING COUNT(*)>=5 0RDER BY 3 DESC