单选题:给student表增加一个“平均成绩”字段(数值型,总宽度6,2位上数)的SQL命令是(  )。

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题目内容:
给student表增加一个“平均成绩”字段(数值型,总宽度6,2位上数)的SQL命令是(  )。 A.ALTER TABLE student ADD平均成绩N(6,2)
B.ALTER TABLE student ADD平均成绩D(6,2)
C.ALTER TABLE student ADD平均成绩E(6,2)
D.ALTER TABLE student ADD平均成绩Y(6,2)
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