举例说明马丁的观点:

和 PS:-正如Mikael Eriksson正确提到的(和文档很好)，只要您正在处理的那一列有一个 Identity Specification ，它就会一直显示为灰色.默认约束.

And PS: - as Mikael Eriksson rightfully mentions (and documents nicely), this Identity Specification remains grayed out as long as that column you're working on has a default constraint.