VSTS 2008 Database Edition 似乎不知道“DATEADD”；常数，有什么想法吗？
我正在尝试使用 VSTS 2008 数据库版本实现数据库构建。构建总是在以下约束下失败：
ALTER TABLE [dbo].[tablename]
ADD CONSTRAINT [DF_tablename_date] DEFAULT (CONVERT([varchar],dateadd(hour,(-1),getdate()),(1))) FOR [date];
它显示的错误如下：
TSD03082: The name "hour" is not permitted in this context. Valid expressions are constants, constant expressions, and (in some contexts) variables. Column names are not permitted.
有人知道这里出了什么问题吗？
I'm trying to implement a database build using VSTS 2008 Database Edition. The build always fails on the following constraint:
ALTER TABLE [dbo].[tablename]
ADD CONSTRAINT [DF_tablename_date] DEFAULT (CONVERT([varchar],dateadd(hour,(-1),getdate()),(1))) FOR [date];
The error that it shows is the following:
TSD03082: The name "hour" is not permitted in this context. Valid expressions are constants, constant expressions, and (in some contexts) variables. Column names are not permitted.
Anybody have an idea what is wrong here?
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评论（2）
您是否尝试过将
hour括在方括号[hour]中？Have you tried wrapping
hourin square brackets,[hour]?在MSDN上问了同样的问题：
http://social .msdn.microsoft.com/Forums/en-US/vstsdb/thread/24afdc7e-3cef-4322-99ff-76ac5174cf3c/
看起来这是一个错误。线程中建议了一种解决方法。
Asked the same question on MSDN:
http://social.msdn.microsoft.com/Forums/en-US/vstsdb/thread/24afdc7e-3cef-4322-99ff-76ac5174cf3c/
Looks like it's a bug. A workaround has been suggested in the thread.