xml - How to read a part of an XML as an XML in SQL Server 2008 R2

Question

I am using SQL Server 2008 R2 and my stored procedure takes in a structured XML which has multiple levels like this:

DECLARE @XML xml = 
'<Main>
    <User id="1">
        <Departments isSingle="0">
            <Department id="1">Admin</Department>
            <Department id="2">HR</Department>
            <Department id="3">Development</Department>
        </Departments>
    </User>
    <User id="2">
        <Departments isSingle="1">
            <Department id="1">Admin</Department>            
        </Departments>
    </User>
</Main>'

From the above example I want to get 2 columns for Users with multiple departments (isSingle="0") where first column is the user id and second column is the whole <Departments> XML.

I can get the user id with the following query but how to get the Departments section as an XML:

SELECT
      T.C.value('(../@id)','int') AS UserID
    , T.C.value('(../Departments)[1]','nvarchar(max)') AS DepartmentsXML 
FROM 
@XML.nodes('/Main/User/Departments[@isSingle="0"]') AS T(C)

It does not allow me to use xml as datatype in place of nvarchar(max)

If details are not clear let me know and I will try to refine it. Any help is appreciated.

Answer 1

你很接近 - 只需.query('.')用于你的第二列：

SELECT
      T.C.value('(../@id)','int') AS UserID, 
      T.C.query('.') AS DepartmentsXML 
FROM 
@XML.nodes('/Main/User/Departments[@isSingle="0"]') AS T(C)

这将返回.nodes()调用选择的 XML 片段作为 XML。