主关键字

因此您需要将Employee的外部关键字属性，与Department的主关键字映射上。

Therefore , you need to map the foreign key attribute in Employee to the Department 's primary key .

使用JSF表达式（param.empno）作为主关键字的值。

Leave the JSF expression { param . empno } as the primary key value .

该机制根据服务消费者的消费历史，以服务质量QoS要求中的主要参数作为主关键字，进行分类排序，并利用本地缓存，加快了服务发现的速度。

Based on the information of the used resources previously for services consumers , this mechanism utilizes the local caches to speed up the discovery of services .

一个JPA实体中的注释，可以显示出表格的列，其他表格之间的关系，主关键字以及等等。

Annotations within a JPA entity can represent table columns , relationships to other tables , primary keys , and so on .

如果出现一条出错信息，声称没有定义一个主关键字，那么您可以选择empno作为主关键字。

If an error message appears stating that a primary key is not defined , select empno as the primary key .

接下来，您可以看到“deptno”已经带上了@Id注释，意味着它就是主关键字属性。

Next , you see that " deptno " has been annotated with an @ Id annotation , signifying that it is the primary key attribute .

选择要链接到主关键字字段的单元格。

Choose the cells to be linked to the primary key fields .

要访问数据库表，必须选择某个主关键字字段。

You must select a primary key field for accessing the database table .

该表的关键字集中已有一个主关键字。

There is already a primary key in this table 's key collection .

“从数据库表中选择构成主关键字的两个字段。”

" Choose two fields from the database table that comprise the primary key . "

索引重建仅适用于主关键字或唯一关键字（未强制索引外部关键字）。

Index rebuild is only available for Primary or Unique keys ( Foreign keys do not have enforcing indexes ) .

通过在图形数据库和属性数据库中设立主关键字来实现图形数据和属性数据的无缝连接。

And more , the conjunction of graph and data is realized seamlessly by setting a main-keyword in the database .

典型的方法是根据实体的主关键字进行查询，因为这可以保证产生一个独一无二的结果。

The typical method is to look up the entity by its primary key , because that will guarantee a unique result .

并将各地地名作为主关键字，以实现空间库与属性库以及各属性库之间的关联。

We use place name as the primary key word to build the relationships between the spatial database and attribute database or each attribute tables .

可以选择1到5个字段以包括数据库表的主关键字。不能有所有关键字字段的值都相同的两个记录。

You can select from 1 to 5 fields to comprise a primary key for the database table . No two records should have the same values for all key fields .

操作数据库是为已知的任务和负载设计的，如使用主关键字索引和散列，检索特定的记录，和优化“罐装的”查询。

An operational database is designed and tuned from known tasks and workloads , such as indexing and hashing using primary keys , searching for particular records , and optimizing " canned " queries .

无法从服务器中检索主组件关键字列表。

Unable to retrieve master component keyword list from the server .

就这类问题的子类给出了一种通过依赖矩阵求出全部主属性的方法，进而得出主关键字。

This paper gives a availability method based on Dependency - matrix that can find all primary attributes and get primary key .