Query XML data in SQL Server 2008 R2

Question

I am trying to parse through an XML in SQL Server 2008 R2 and I am having some issues. I am trying to parse through the items for each parent node, but I'm not getting the solution The XML data is below:

<MerchantInfo xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <Active>true</Active>
  <CreatedDate>2015-04-16T00:00:00+05:30</CreatedDate>
  <CreatedBy>63747</CreatedBy>
  <ModifiedBy>63747</ModifiedBy>
  <ModifiedUserName>charucsrawat@hpcl</ModifiedUserName>
  <MerchantCode>0</MerchantCode>
  <RetailOutletName>Gayatri Automobiles</RetailOutletName>
  <DealerName>Vandana Singh</DealerName>
  <ERPCode>16622710</ERPCode>
  <OwnerID>0</OwnerID>
  <ICICIAcDetailsRequired>false</ICICIAcDetailsRequired>
  <SupplyLocationCode>Mirzapur</SupplyLocationCode>
  <IsLive>false</IsLive>
  <LiveSAM>1</LiveSAM>
  <TestSAM>0</TestSAM>
  <OutletCategory>8001</OutletCategory>
  <HighwayNo>NH7</HighwayNo>
  <HighwayName>Mirzapur Rewa Road</HighwayName>
  <SecurityDeposit>10000</SecurityDeposit>
  <HSDSaleMonthly>200</HSDSaleMonthly>
  <Comments />
  <VerifiedDate>0001-01-01T00:00:00</VerifiedDate>
  <VerifiedBy>0</VerifiedBy>
  <isCloned>false</isCloned>
  <VerifiedByUserName />
  <ApprovedDate>0001-01-01T00:00:00</ApprovedDate>
  <ApprovedBy>0</ApprovedBy>
</MerchantInfo>

my code is :

;WITH XMLNAMESPACES ('http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"' AS mi)
SELECT 
    T.C.value('mi:erpcode[1]','numeric') as erpcode,
    T.C.value('mi:SecurityDeposit[1]','varchar(50)') AS securitydeposit
FROM ChangeEvent ce
    CROSS APPLY changeddata.nodes('mi/erpcode[1]') AS T(C)
WHERE Ce.EntityTypeId = 2
    AND CAST(Ce.ChangedData AS VARCHAR(MAX)) LIKE '%16622710%'
GO

What I am looking for is:

erpcode  securitydeposit
16622710  10000

Kindly help

Answer 1

You don't need ;WITH XMLNAMESPACES for this purpose since XML elements involved in the query doesn't use any namespace prefix and the XML document doesn't have defult namespace too.

Also note that XML element/attribute name are case-sensitive (fe erpcode != ERPCode ) :

SELECT 
    T.C.value('ERPCode[1]','numeric') as erpcode,
    T.C.value('SecurityDeposit[1]','varchar(50)') AS securitydeposit
FROM ChangeEvent ce
    CROSS APPLY ChangedData.nodes('MerchantInfo') AS T(C)
WHERE Ce.EntityTypeId = 2
    AND T.C.value('ERPCode[1]','numeric') = 16622710

Demo