How do I query repeating XML child nodes inside parent repeating nodes? - sql-server

Question

I have the following XML stored in an nText column (not my design, older database). I need to pull the PolicyNumber and the CvgCode that is a property of Coverage child node.
<efs:Request
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:efs="http://www.slsot.org/efs"
xsi:schemaLocation="http://www.slsot.org/efs
http://efs.slsot.org/efs/xsd/SlsotEfsSchema2.xsd">
<EfsVersion>2.0</EfsVersion>
<Batch BatchType="N" AgLicNo="12345" ItemCnt="69">
<EFSPolicy>
<PolicyNumber>POL12345</PolicyNumber>
<Binder>0086592YZ</Binder>
<TransType>N</TransType>
<Insured>Dummy Co LLC</Insured>
<ZipCode>75225</ZipCode>
<ClassCd>99930</ClassCd>
<PolicyFee>35.00</PolicyFee>
<TotalTax>36.62</TotalTax>
<TotalStampFee>1.13</TotalStampFee>
<TotalGross>792.75</TotalGross>
<EffectiveDate>09/17/2018</EffectiveDate>
<ExpirationDate>09/17/2019</ExpirationDate>
<IssueDate>09/20/2018</IssueDate>
<ContUntilCancl>N</ContUntilCancl>
<FedCrUnion>N</FedCrUnion>
<AORFlag>N</AORFlag>
<CustomID>043684</CustomID>
<WindStormExclusion>N</WindStormExclusion>
<CorrectionReEntry>N</CorrectionReEntry>
<Coverages>
<Coverage CvgCode="9325">720.00</Coverage>
</Coverages>
<Securities>
<Company CoNumber="80101168">100.00</Company>
</Securities>
</EFSPolicy>
<EFSPolicy>
...
</EFSPolicy>
</Batch>
</efs:Request>
And here is the SQL code I am using to extract the PolicyNumber (so far).
with cte_table(BatchID, xmlData)
AS
(SELECT BatchID, CAST(CAST(xmlData AS VARCHAR(MAX)) AS XML) from
Batches)
select
s.BatchID
,t.c.value('PolicyNumber[1]', 'varchar(max)') as PolicyNumber
from cte_table as s
cross apply s.xmlData.nodes('/*:Request/Batch/EFSPolicy') as t(c)
where BatchID in (select batchID from Batches where CreateDate between '1/1/19' and getdate())
I have tried a second CROSS APPLY on the Coverages node, but that was giving me all the Coverage values (not CvgCode property) for every batch, so my result set was 100+ times too many rows. I assume that was due to the 2nd CROSS APPLY, is there a INNER JOIN type CROSS APPLY?

Answer 1

You need to declare your namespaces to retrieve the data:
DECLARE #XML xml = '<efs:Request
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:efs="http://www.slsot.org/efs"
xsi:schemaLocation="http://www.slsot.org/efs
http://efs.slsot.org/efs/xsd/SlsotEfsSchema2.xsd">
<EfsVersion>2.0</EfsVersion>
<Batch BatchType="N" AgLicNo="12345" ItemCnt="69">
<EFSPolicy>
<PolicyNumber>POL12345</PolicyNumber>
<Binder>0086592YZ</Binder>
<TransType>N</TransType>
<Insured>Dummy Co LLC</Insured>
<ZipCode>75225</ZipCode>
<ClassCd>99930</ClassCd>
<PolicyFee>35.00</PolicyFee>
<TotalTax>36.62</TotalTax>
<TotalStampFee>1.13</TotalStampFee>
<TotalGross>792.75</TotalGross>
<EffectiveDate>09/17/2018</EffectiveDate>
<ExpirationDate>09/17/2019</ExpirationDate>
<IssueDate>09/20/2018</IssueDate>
<ContUntilCancl>N</ContUntilCancl>
<FedCrUnion>N</FedCrUnion>
<AORFlag>N</AORFlag>
<CustomID>043684</CustomID>
<WindStormExclusion>N</WindStormExclusion>
<CorrectionReEntry>N</CorrectionReEntry>
<Coverages>
<Coverage CvgCode="9325">720.00</Coverage>
</Coverages>
<Securities>
<Company CoNumber="80101168">100.00</Company>
</Securities>
</EFSPolicy>
<EFSPolicy>
</EFSPolicy>
</Batch>
</efs:Request>';
WITH XMLNAMESPACES('http://www.w3.org/2001/XMLSchema-instance' as xsi,
'http://www.slsot.org/efs' AS efs)
SELECT EFS.[Policy].value('(./PolicyNumber/text())[1]','varchar(25)') AS PolicyNumber,
EFS.[Policy].value('(./Coverages/Coverage/#CvgCode)[1]','int') AS CvgCode --Assumes only 1 CvgCode per policy
FROM (VALUES(#XML)) V(X)
CROSS APPLY V.X.nodes('efs:Request/Batch/EFSPolicy') EFS([Policy]);