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

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。

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Select each of the controls listed in the following table and update the Label and Alert messages as shown in the table: Select input [EMPNO:] and click Delete.

选择下表列出的所有控件，并且更新表中所示的标签和警告消息：选择input [empno：]，然后单击Delete。

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