获取一个值,该值指示某一属性是否表示基础数据中的标识字段。
Gets a value indicating whether a property is in the primary key in the underlying data.
实验结果表明,标识字段比特流随机测度值随着比特流长度的增加整体上呈递减趋势。
The result of the experiment shows that with the increase of the length, the random metric of bit flow tends to reduce gradually.
一个数据表都有一个或者是若干个列,而每个表都可以有唯一标识列的字段,这些能够标识字段的列就是所谓的主键。
A database table commonly has a column, or group of columns, that uniquely identifies each row in the table. This identifying column or group of columns is called the primary key.
一旦您迁移了数据,您可能需要更新您的数据库,使之在您自动生成的标识字段中从高于迁移数据所有值的数字开始计数。
Once you have moved the data, you might need to update your database to start the numbering of your automatically generated identity columns higher than all the existing values in the migrated data.
通过使用这些属性,元素可以引用一个或多个其它元素(通过在指向元素自己的IDREF或idrefs域中包含那些元素的标识字段的值)。
Using these attributes, an element may refer to one or more other elements (by including the value of those elements' ID fields in the pointing element's own IDREF or IDREFS field).
通过使用这些属性,元素可以引用一个或多个其它元素(通过在指向元素自己的IDREF或idrefs域中包含那些元素的标识字段的值)。
Using these attributes, an element may refer to one or more other elements (by including the value of those elements' ID fields in the pointing element's own IDREF or IDREFS field).
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