In addition, if you have a table with many columns that aren't typically used, you are also wasting disk space with NULL value fields.
此外，如果您有不常用的含多个列的一个表，您也在通过null值字段浪费磁盘空间。
Enter a space if you want a value to be null.
如果您想要一个值为空，可以输入一个空格。
Beam pattern null in the direction of the jamming is formed by a space filtering and assisted receive channels to suppress the jamming.
它是采用空间滤波技术，通过辅助通道在干扰方向上形成波束图的零点来实现对干扰信号的抑制。
First, the actual occurrence of a specific value may indicate whether there are issues such as incomplete data by the presence of a Null value, a Space, and so on.
首先，一个特定值的实际出现可能表明是否存在问题，例如由于null值、空格等造成的不完整的值。
First, by redefining the within class scatter matrix and the between class scatter matrix, a new null space method was presented.
首先，通过重新定义样本的类内散布矩阵和类间散布矩阵，提出了一种新的零空间法。
A null is not the same as a zero or a blank space.
一个空值是不同于零或者一个空格符的。
First, a null-space restriction is used to define the searching space, and then, CTS is applied to search the optimal result of the integer ambiguity in the searching space.
首先用零空间约束法确定搜索空间，然后用CTS搜索整周模糊度的最优解。
First, a null-space restriction is used to define the searching space, and then, CTS is applied to search the optimal result of the integer ambiguity in the searching space.
首先用零空间约束法确定搜索空间，然后用CTS搜索整周模糊度的最优解。
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