设Students表有三列Number 1.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 Number3,Number2