null
US:/nʌl/
UK:/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
Word forms: (复数) nulls (过去式) nulled (现在分词) nulling
Examples
1.
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。
2.
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。
3.
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。
4.
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。
5.
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。
6.
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。
7.
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。
8.
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。
9.
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。
10.
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。