• null

    • 美 [nʌl]

    释义

    • na.没有价值的;无用的;【法】无法律效力的;【科技】没有 
    • 网络【数】数字零;【计】空位;空白符号;【电子】无信号 

    汉英

    • 1.没有价值的;无用的
    • 2.【法】无法律效力的
    • 3.【科技】没有
    • 4.【数】相当于数字零的
    • 5.【逻,数】空集的
    • 6.无特点的
    • 1.没有价值的;无用的
    • 2.【法】无法律效力的
    • 3.【科技】没有
    • 4.【数】相当于数字零的
    • 5.【逻,数】空集的
    • 6.无特点的
    • 1.【数】数字零
    • 2.【计】空位;空白符号
    • 3.【电子】无信号
    • 4.〈比喻〉空虚
    • 1.【数】数字零
    • 2.【计】空位;空白符号
    • 3.【电子】无信号
    • 4.〈比喻〉空虚
    • 1.抵消
    • 2.【法】〈罕〉宣布无效
    • 3.〈罕〉彻底消灭

    汉汉意思

    • 1.with no value or effect
    • 2.[Law]of no legal or binding force
    • 3.[Sci-Tech]amounting to nothing
    • 4.[Mathematics]having or associated with the value zero
    • 5.[Logic,Mathematics]of a class or set: having no members
    • 6.lacking distinctive qualities, traits, or characteristics
    • 1.with no value or effect
    • 2.[Law]of no legal or binding force
    • 3.[Sci-Tech]amounting to nothing
    • 4.[Mathematics]having or associated with the value zero
    • 5.[Logic,Mathematics]of a class or set: having no members
    • 6.lacking distinctive qualities, traits, or characteristics
    • 1.[Mathematics]a zero
    • 2.[Computer]a character which produces no effect or action but is used to fill up a space or to separate pieces of information
    • 3.[Electronics]a condition of no signal
    • 4.<figurative>a state of emptiness, featurelessnes
    • 1.[Mathematics]a zero
    • 2.[Computer]a character which produces no effect or action but is used to fill up a space or to separate pieces of information
    • 3.[Electronics]a condition of no signal
    • 4.<figurative>a state of emptiness, featurelessnes
    • 1.to cancel out or remove (a force, effect, signal, etc)
    • 2.[Law]<rare>to annul or cancel
    • 3.<rare>to destroy or efface completely

    网络释义

    • 1.
      空指针异常,某个变量为null),而调用了他的某个方法或者属性|评论 你没有给int[] card 往里赋值吧|评论 空指针异常,贴 …
    • 2.
      空值
      空值没有数据类型,在数据库中表示未知或未确定的值,无论是数字类型、文本类型或日期类型,都可以用统一的空值(NULL) …
    • 3.
      空字符
      的以空字符null)结束的命令字符串,该域可以为空(null);cbData 域值指定该命令字符串的长度。如果dwData域值不为1…
    • 4.
      英语词汇-数学词汇_专业词汇 ... notation 记法;记号 null ; 空 null hypothesis 零假设; 虚假设 ...
    • 5.
      空指针
      l 空指针null):具有0号地址的指针,它不指向任何数据; 一般用以初始化没有任何指向的指针,在iostream.h中定义。
    • 6.
      无效的
      英语词根6 - Leo.Zhu - 博客园 ... nocturne n 小夜曲,梦幻曲 null a 无效的,等于零的 nutrient n 营养品 ...
    • 7.
      空的
      如果你指定了空的NULL)安全描述符,那么管道将得到一个默认的安全描述符。管道默认安全描述符里的ACLs来自于管道创 …
  • 实用场景例句

    • 全部

    This tip addresses one of those cases: the distinction between an array which is null, and an array which has no elements.

    这里介绍的技巧用于处理其中的一个情况:一个为“零”的数组和一个没有元素的数组之间的差别。

    NULL constants cannot be inserted into a timestamp column through a distributed query.

    无法通过分布式查询将NULL常量插入timestamp列中。

    This certificate shall be considered null and void in case of any alteration.

    任何修改,本证书将被视为无效。

    In todo_foreign, that would require two columns; the deletion date might be null to indicate that the item is still active.

    在todo_foreign中,这将需要两个列;删除日期可能为null,表示该事项仍然在活动中。

    For a calculation of the exact benefits of NULL and system default compression, it would be necessary to count these values per column.

    若要精确计算NULL压缩和系统默认值压缩所节省的空间,则需要逐列地计算这些值的数量。

    In China, where the deprivation of a minor violation of the law and unable to work the right to inherit part of the heirs, null and void.

    在中国,凡违背法律规定剥夺未成年人和无劳动能力的继承人的继承权的部分,归于无效。

    To declare a variable and initialize it without assigning it a particular value, assign it the JScript value null.

    若要在不分配特定值的情况下声明一个变量并对其进行初始化,请为其分配JScript值null

    The results do not make it easy to distinguish a NULL in the data from a NULL that represents a failure to join.

    从结果中很难区分数据中的NULL值和表示联接失败的NULL值。

    Attribute value with a null reference assigned to a reference type or to a nullable value type.

    属性值等同于分配给引用类型或分配给可为空值类型的空引用。

    The constructor function has no parameters and returns an instance of the type with all of its attributes set to null values.

    构造函数没有参数,并且返回的类型实例中的所有属性都为空。

    Experimenters have yet to see such a frame, but the null result may simply be for want of sufficient precision.

    实验学家目前还没看到这样的座标,不过看不出迹象并不代表没有,也许只是缺乏足够的精确度使然。

    Columns of a unique index are allowed to be NULL, while columns in a unique constraint are not.

    唯一索引的列可以为NULL,而唯一约束的列不能为NULL。

    It used to be that the goal in econometric work was to get results that were statistically significant, to reject the null hypothesis.

    过去,搞经济计量学时,目标往往是争取让获得的结果,在统计上有显著意义,这样就能拒绝零假设。

    Consequently, any information on the investigation that comes from another source is null and void if it has not been validated by the BEA.

    因此,从其他来源的任何调查的信息是无效的,如果它没有被验证了BEA。

    This routine initially checks if the passed inquiry context is not NULL and if it a context for group member.

    它首先检查传递的查询上下文是否非NULL,以及是否是组成员的上下文。

    For this reason, a scene which has no formal links always has at least one link in it, though this link has a ref value of "null" .

    因此,没有正式链接的场面也要包含至少一个链接,这个链接的ref值是“null”。

    Remember, in C, a string is nothing but an array of characters with a terminating NULL character (ASCII 0).

    请记住,在C语言中,字符串只是一个带有终止NULL字符(ASCII0)的字符数组。

    The goal with validation is to avoid some simple errors, such as trying to put a NULL into a field that doesn't accept them.

    验证的目标就是要避免一些简单错误,例如尝试将NULL放入不接受这种值的字段。

    Though you did not specify that column, the Rails migration created it for you anyway, with auto_increment and NOT NULL.

    虽然没有指定这个列,但是Rails迁移会自动创建它,并具有auto_increment和NOTNULL属性。

    A value of NULL is not considered to be greater than, less than, or equivalent to any other value, including another value of NULL.

    NULL值不视为大于、小于或等于任何其他值,包括另一个NULL值。

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