Default2 Object
后续版本的 Microsoft SQL Server 将删除该功能。请避免在新的开发工作中使用该功能，并着手修改当前还在使用该功能的应用程序。
The Default object represents the attributes of a single default in Microsoft SQL Server 2000 and later. SQL Server defaults provide data to columns and user-defined data types when no other data is available on an INSERT statement execution. The Default2 object extends the functionality of the Default object.
注释
The Default2 object extends the functionality of the Default object for use with features that were introduced in SQL Server 2000. It also inherits the properties and methods of the Default object.
The IsDeleted property of the Default2 object may not be compatible with SQL Server 7.0 or earlier. For more information about using the Default2 object in an application that also runs with SQL Server version 7.0, refer to the Remarks section for the IsDeleted property. For more information, see Programming Extended SQL-DMO Objects.