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【单选题】
设Students表有三列Number1、Number2、Number3,并且都是整数类型,则以下()查询语句能按照Number2列进行分组,并在每一组中取Number3的平均值。A.
SELECT AVG(Number3) FROM Students
B.
SELECT AVG(Number3) FROM Students ORDER BY Number2
C.
SELECT AVG(Number3) FROM Students GROUP BY Number2
D.
SELECT AVG(Number3) FROM Students GROUP BY Number2,Number3
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