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1.NULL是指( )。 (单选题)
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2.(单选题) null
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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.select (NULL<=>NULL) is NULL;的结果为____。
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10.null==undefined