Sql server 2005 初始化xml变量

当我这样做时，我会收到以下错误消息：

关键字“SELECT”附近的语法不正确

谁能帮我把xmlcolumn值分配给xml变量。

使用

DECLARE @XML1 XML

SET @XML1=SELECT XMLCOLUMN FROM TABLE WHERE ID='123-456'

或

如果查询只返回一行，则它们的行为相同，但在其他方面有所不同

SET @XML1= (SELECT XMLCOLUMN FROM TABLE WHERE ID='123-456')

SET @XML1= (SELECT XMLCOLUMN FROM TABLE WHERE ID='123-456')

+----+-------------------------------------------------------+------------------------------------------+
|    |                        SELECT                         |                   SET                    |
+----+-------------------------------------------------------+------------------------------------------+
| 0  | No Assignment made. Variable has original value.      | Variable set to null                     |
| 1  | Variable assigned the one matching value              | Variable assigned the one matching value |
| >1 | Variable assigned arbitrary value from matching rows. | Error raised                             |
+----+-------------------------------------------------------+------------------------------------------+