Xquery TSQL：遍历具有多个xmlns，xmlns：xsd和xmlns：xsi的父节点时如何检索元素数据

Question

I need to retrieve the 'true' value in processquotedetail element.

What xmlnamespaces would i have to provide, and specify in an outer apply in order to successfully retrieve 'true'

I have changed the xmlns: values

I have tried the below and several other slight alternatives, all of which are returning null. Can you explain why the below doesn't work, and why what does work, does?

Thank you

The query:

WITH XMLNAMESPACES('web.servivces.com"' as  pmq,
                    'www.test.com/' as q,
                    'www.test.com/request/' as r )

select 
x.RequestID,       dc.tx.value('pmq:Control[1]/pmq:ProcessQuoteDetail[1]','nvarchar(max)')
dc.tx.value('Control[1]/ProcessQuoteDetail[1]','nvarchar(max)')

from [dbo].[uvw_decompressXML_DC_Quote] x  

outer apply x.DCRequest.nodes('server/requests/Session.setDocumentRq/session/data/policy
r:AdditionalData/r:KeyValuePair/q:Key/q:Value/pmq:PMQuoteData') as dc(tx) 

The XML:

XML: 
<server>
  <requests>
    <Session.loginRq userName="admin" password="admin" />
    <Session.setDocumentRq>
      <session>
        <data>
          <MotorQuoteID />
          <TransactionReason>Rating</TransactionReason>
          <policy>
            <AdditionalData xmlns="www.test.com/request/" 
             xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
              <KeyValuePair>
                <Key xmlns="www.test.com/">AggregatorXML</Key>
                <Value xmlns="www.test.com/">
                  <PMQuoteData xmlns="web.servivces.com">
                    <Control>
                      <ProcessQuoteDetail>true</ProcessQuoteDetail>

Answer 1

SQL

-- DDL and data population, start
DECLARE @tbl TABLE (ID INT IDENTITY(1,1) PRIMARY KEY, xmlData XML NOT NULL);
INSERT INTO @tbl
VALUES
('<server>
    <requests>
        <Session.loginRq userName="admin" password="admin"/>
        <Session.setDocumentRq>
            <session>
                <data>
                    <MotorQuoteID/>
                    <TransactionReason>Rating</TransactionReason>
                    <policy>
                        <AdditionalData xmlns="www.test.com/request/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
                            <KeyValuePair>
                                <Key xmlns="www.test.com/">AggregatorXML</Key>
                                <Value xmlns="www.test.com/">
                                    <PMQuoteData xmlns="web.servivces.com">
                                        <Control>
                                            <ProcessQuoteDetail>true</ProcessQuoteDetail>
                                        </Control>
                                    </PMQuoteData>
                                </Value>
                            </KeyValuePair>
                        </AdditionalData>
                    </policy>
                </data>
            </session>
        </Session.setDocumentRq>
    </requests>
</server>');
-- DDL and data population, end

WITH XMLNAMESPACES('web.servivces.com' as ns3,
                    'www.test.com/' as ns2,
                    'www.test.com/request/' as ns1 )
SELECT tbl.id, col.value('(ns3:ProcessQuoteDetail)[1]', 'VARCHAR(10)') as [ProcessQuoteDetail]
FROM @tbl AS tbl
CROSS APPLY tbl.XMLDATA.nodes('/server/requests/Session.setDocumentRq/session/data/policy/ns1:AdditionalData/ns1:KeyValuePair/ns2:Value/ns3:PMQuoteData/ns3:Control') tab(col);