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).

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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.

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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.

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