The primary reason for using an ri constraint is to ensure that data integrity is maintained whenever one table references another.
使用一个RI约束的主要原因是，确保当一个表引用另一个表时数据完整性得到维护。
The primary driver for using this pattern is to provide real-time access to back-end applications and data from Web applications -- "back-end applications and data" being the key.
应用这种模式的主要驱动程序提供了对后端应用程序以及Web 应用程序中的数据进行实时访问的功能，它以“后端应用程序和数据”作为主键。
The simplest way to access persistent data is by using the find method. Here is an example of an application using the entity manager to find an object by its primary key.
最简单的访问持久性数据的方法是使用find方法。
Finite element analysis data of the end component of PMLSM was interpolated using cubic spline function at incompletely coupled zone of the secondary and primary.
在初、次级不完全耦合区域，采用样条函数对永磁直线同步电动机磁阻力的端部分量的有限元数据进行插值。
We meta-analysed data using a random-effects model on the primary and key secondary outcomes and formally assessed heterogeneity.
我们在主要与关键次级结果中，以随机效应模式将资料进行统合分析，并正式地评估其异质性。
The direction and value of horizontal stray field induced by the toroidal field coils and primary windings are determined using vertical displacement data.
通过垂直位移测量鉴别了纵向场线圈和加热场绕组引起的水平杂散场的方向和大小。
Knowing the conditions of load and environment under which the component must operate, engineers must then select an appropriate material, using tabulated test data as the primary guide.
了解构件必须运行的载荷条件和工作环境，工程师必须以测试数据表为主要依据选用一种恰当的材料。
This article describes NPs in a primary care setting who collected standardized nursing data using the Omaha System.
本文介绍了核动力源的一个主要照顾谁制定标准护理资料收集使用奥马哈系统。
That aside, indexes on IOTs provide fast and efficient access to the data in the IOT using columns other than the primary key.
为什么用了其他列而不是主键时就可以提供快速和有效的访问数据呢?。
Our primary observation results may provide valuable data for development of the bio-engineering using the silkworm to produce protein medicine for human beings.
同时，培养细胞实验说明不同细胞的感 染和表达的特性不同。以上结果可以为利用家蚕生产生物药品的基因工程提供参考。
To work around this problem, select the following columns of the selected table when you add a data form by using the Data Form Wizard: the primary column and a column that does not permit NULLs.
若要解决此问题，请在添加数据窗体时通过使用“数据窗体向导”选择所选表中的以下列：主列和不允许 NULL 的列。
This paper analyzes the situation of primary health providers using the data from the 4th National health Services survey and a specific survey.
本文利用国家第四次卫生服务总调查以及专题调查资料，对城乡基层卫生机构服务开展情况进行了分析。
This paper analyzes the situation of primary health providers using the data from the 4th National health Services survey and a specific survey.
本文利用国家第四次卫生服务总调查以及专题调查资料，对城乡基层卫生机构服务开展情况进行了分析。
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