SQL Server Management Studio 2012 中的自动增量主键
我如何auto increment primary key 在SQL Server 数据库表中，我看过论坛但可以不知道如何.
How do I auto increment the primary key in a SQL Server database table, I've had a look through the forum but can't see how.
我查看了属性但看不到选项，我看到了一个答案，您可以转到 Identity 规范属性并将其设置为 yes 并设置 Identity将 增加到 1，但该部分是灰色的，我无法将 no 更改为 yes.
I've looked the the properties but can't see an option, I have seen an answer where you go to the Identity specification property and set it to yes and set the Identity increment to 1, but that section is grayed out and I can't change the no to yes.
一定有一种简单的方法可以做到这一点，但我找不到.
There must be a simple way to do this but I can't find it.
推荐答案
确保Key列的数据类型为int，然后手动设置identity，如图
Make sure that the Key column's datatype is int and then setting identity manually, as image shows
或者运行这段代码
-- ID is the name of the [to be] identity column
ALTER TABLE [yourTable] DROP COLUMN ID
ALTER TABLE [yourTable] ADD ID INT IDENTITY(1,1)
代码将运行，如果 ID 不是表中唯一的列
the code will run, if ID is not the only column in the table
图像参考先进先出
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