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: