此单元格含有数据库主关键字的最近检索值。
This cell contains the most recently retrieved value for the primary database key.
在接下来的页面中，您要选择在什么地方检索主关键字的值(图28)。
On the next page, you choose where to retrieve the value of the primary key (Figure 28).
注意它们包含了与数据库表列，以及设置的主关键字、关系相对应的区域(图19)。
Notice that they contain fields corresponding to the database table columns and that the primary keys and relationships have been set (Figure 19).
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.
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.
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.
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.
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.
只需在主站点的搜索栏中输入简单的关键字，就可以找到大量可能有帮助的建议和信息。
Just putting a simple keyword into the main site's search bar can provide thousands of possible Suggestions for information that might help.
在关系数据库规范化理论中，求解后选关键字和主属性一直是一个棘手的问题。
In normalization theory of relation database, finding candidate key and primary attribute is always a difficult problem.
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This video explains the benefits of Google AdWords and features that aim to improve advertising p...
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