Oracle中,执行语句:SELECT address1||‘,‘||address2||‘,‘||address3 “Address“ FROM employ;将会返回()列。

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Oracle中,执行语句:SELECT address1||‘,‘||address2||‘,‘||address3 “Address“ FROM employ;将会返回()列。

A.0.0

B.1.0

C.2.0

D.3.0

参考答案:

答案:B