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。

youdao

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。

youdao