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null

美 [nʌl]英 [nʌl]

adj.没有价值的；无用的；【法】无法律效力的；【科技】没有
n.【数】数字零；【计】空位；空白符号；【电子】无信号
v.抵消；〈罕〉【法】宣布无效；〈罕〉彻底消灭
网络空值；空字符；空指针

复数：nulls 过去式：nulled 现在分词：nulling

null

null

搭配反义词

Adj.+n.

权威英汉双解英-汉英-英网络释义

null

adj.

1.零值的；等于零的having the value zero

IDM

null and void

无法律效力的；无效的having no legal force; not valid

1

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。

2

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。

3

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。

4

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。

5

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。

6

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。

7

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 。

8

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。

9

10

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。

11

12

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 。

13

14

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 。

15

16

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 ”。

17

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。

18

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。

19

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。

20

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。

21

Exclude columns: The name of the columns that you want to be excluded can be null .

排除列：您希望被排除的列名称可以为空。

22

At least one of the null values must be a typed NULL .

至少应有一个空值为 NULL 类型。

23

The property acquired as a result of a contract shall be returned after the contract is confirmed to be null and void or has been revoked .

合同无效或者被撤销后，因该合同取得的财产，应当予以返还。

24

The SUM function returns the total sum of a column in a given selection . NULL values are not included in the calculation.

使用 SUM 函数可以返回给定的选择中列的所有记录值的累计合。NULL 值不包括在内。

25

The argument that is set to null could have been used to transmit additional properties to the dynamic page instance .

设置为 null 的参数可用于将附加属性传送到动态页面实例。

26

The following table illustrates the relationship between the existence of a default and the definition of a column as NULL or NOT NULL .

下表说明默认值的存在与将列定义为 NULL 或 NOTNULL 之间的关系。

27

When you work with strings with a null value , the result of the concatenation depends on the session settings .

处理具有空值的字符串时，串联结果取决于会话设置。

29

Since the requirement is to only suppress nulls , the visual null suppression can be replaced by the Null suppression on the actual query .

因为需求是仅抑制 nulls ，可视的 nullsuppression 可由实际查询上的 Nullsuppression 替换。

30

If you were using an Object-based stack , you would simply return null , but a generic stack could be used with value types as well.

如果您使用基于 Object 的堆栈，则可以简单地返回 null ，但是您还可以通过值类型来使用一般堆栈。

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