使用触发器.写一个 更新/删除Dept表上的触发器，以便如果deptnp列有任何更改，它也会对emp表进行更新.

Use Triggers. Write an Update/Delete trigger on the Dept table such that if there''s any change to the deptnp column, it does an update of the emp table as well.

 但通常不是保持更新/更改主键的好主意.仅当引用记录的数量增加时，才会产生影响.

 But it''s usually not a good idea to keep updating/changing primary keys. The impact will felt only when the number of referenced records go up.