试题与答案

关于SQL中的量词叙述正确的是________。A.ANY和SOME是同义词 B.A

题型:单项选择题

题目:

关于SQL中的量词叙述正确的是________。

A.ANY和SOME是同义词

B.ANY和ALL是同义词

C.ALL和SOME是同义词

D.ALL和EXISTS是同义词

答案:

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参考答案:C解析: System类是特殊类,它是一个final类,所有的方法都通过变量来调用,即对System类不可能实例化,它主要提供标准输入/输出和系统环境信息的访问与设置。System类中的属性有标准输入、标准输出、...

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