把学生的学号及他的平均成绩定义为一个视图。定义这个视图时,所用的SELECT语句中将出现哪些子句? I. FROM II. WHERE III. GROUP BY IV. ORDER BY
A.
I和II
B.
I和III
C.
I、II和III
D.
全部
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参考答案:
举一反三
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