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- 软件水平考试
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1.null表示“不存在该数据”。
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2.null常量表示对象的引用为空
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3.select (null or null),(null or 1),(null || 0),(-8 or 0);
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4.select (NULL<=>NULL) is NULL;的结果为____。
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5.select (NULL<=>NULL) is NULL;的结果为_____
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6.,"airUpgrade":null,"oneKeyVentilate":null,"voiceCopy":null,"keyUnlock":null,"autoPadlock":null,"autoShutting
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7.select (NULL[=]NULL) is NULL的;
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8.Select 10*Null,10/null,null+10,null-10
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9.在Flume数据采集配置文件中,kafka.bootstrap.servers= node1:9092 ,该配置表示( )
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10.select (NULL<=>NULL) is NULL;的结果为____。