Querying XML Data stored in SQL Server - sql-server

Question

I have a column called Resume of type XML stored in a table in MS-SQL Server.
I want to retrieve all the candidates who are from the city Saginaw.
When I use the query
SELECT Resume.query('(: explicit namespace :)declare namespace ns="Namespace-Resume";
//ns:Address/ns:Addr.Location/ns:Location/ns:Loc.City')
FROM JobCandidate
I get all the values for the city which is fine but when I use the following query:
SELECT Resume.query('(: explicit namespace :)declare namespace ns="Namespace-Resume";
//ns:Location[#ns:Loc.City="Saginaw"]/ns:Name')
FROM JobCandidate
I get an error "There is not attribute named Loc.City".
The sample data is as below:
<ns:Resume xmlns:ns="Namespace-Resume">
<ns:Name>
<ns:Name.Prefix></ns:Name.Prefix>
<ns:Name.First>Shai</ns:Name.First>
<ns:Name.Middle></ns:Name.Middle>
<ns:Name.Last>Bassli</ns:Name.Last>
<ns:Name.Suffix></ns:Name.Suffix>
</ns:Name>
<ns:Address>
<ns:Addr.Type>Home</ns:Addr.Type>
<ns:Addr.Street>567 3rd Ave</ns:Addr.Street>
<ns:Addr.Location>
<ns:Location>
<ns:Loc.CountryRegion>US </ns:Loc.CountryRegion>
<ns:Loc.State>MI </ns:Loc.State>
<ns:Loc.City>Saginaw</ns:Loc.City>
</ns:Location>
</ns:Addr.Location>
</ns:Address>
</ns:Resume>

Answer 1

Your question is not all clear... I'll provide several approaches, one of them will hopefully point you the way (You can copy the whole lot into a query window and execute it stand-alone):
DECLARE #xml XML=
N'<ns:Resume xmlns:ns="Namespace-Resume">
<ns:Name>
<ns:Name.Prefix />
<ns:Name.First>Shai</ns:Name.First>
<ns:Name.Middle />
<ns:Name.Last>Bassli</ns:Name.Last>
<ns:Name.Suffix />
</ns:Name>
<ns:Address>
<ns:Addr.Type>Home</ns:Addr.Type>
<ns:Addr.Street>567 3rd Ave</ns:Addr.Street>
<ns:Addr.Location>
<ns:Location>
<ns:Loc.CountryRegion>US </ns:Loc.CountryRegion>
<ns:Loc.State>MI </ns:Loc.State>
<ns:Loc.City>Saginaw</ns:Loc.City>
</ns:Location>
</ns:Addr.Location>
</ns:Address>
</ns:Resume>';
--Read one element's text with namespaces wildcards
SELECT #xml.value(N'(/*:Resume/*:Name/*:Name.First/text())[1]',N'nvarchar(max)');
--Use a default namespace
WITH XMLNAMESPACES(DEFAULT N'Namespace-Resume')
SELECT #xml.value(N'(/Resume/Address/Addr.Location/Location/Loc.City/text())[1]',N'nvarchar(max)');
--Your sample XML includes one person only, but I assume there are more
--Use a predicate to get the name for a given location
DECLARE #location NVARCHAR(100)=N'Saginaw';--Change this for tests
WITH XMLNAMESPACES(DEFAULT N'Namespace-Resume')
SELECT #xml.value(N'(/Resume[(Address/Addr.Location/Location/Loc.City/text())[1]=sql:variable("#location")]/Name/Name.First/text())[1]',N'nvarchar(max)');
--Read several values of this node
--Use a predicate to get the name for a given location
WITH XMLNAMESPACES(DEFAULT N'Namespace-Resume')
SELECT r.value(N'(Name/Name.First/text())[1]',N'nvarchar(max)')
,r.value(N'(Name/Name.Last/text())[1]',N'nvarchar(max)')
FROM #xml.nodes(N'/Resume[(Address/Addr.Location/Location/Loc.City/text())[1]=sql:variable("#location")]') AS A(r);
UPDATE: The SELECT you provide in comment
The call to nodes() is missing? Try it like this:
DECLARE #location NVARCHAR(100)=N'Saginaw';
WITH XMLNAMESPACES(DEFAULT N'Namespace-Resume')
SELECT r.value(N'(Name/Name.First/text())[1]',N'nvarchar(max)')
,r.value(N'(Name/Name.Last/text())[1]',N'nvarchar(max)')
FROM JobCandidate
CROSS APPLY Resume.nodes(N'/Resume[(Address/Addr.Location/Location/Loc.City/text())[1]=sql:variable("#location")]') AS A(r);
UPDATE 2: Namespace according to your comment
DECLARE #xml XML=
N'<ns:Resume xmlns:ns="http://schemas.microsoft.com/sqlserver/2004/07/adventure-works/Resume">
<ns:Name>
<ns:Name.Prefix />
<ns:Name.First>Shai</ns:Name.First>
<ns:Name.Middle />
<ns:Name.Last>Bassli</ns:Name.Last>
<ns:Name.Suffix />
</ns:Name>
<ns:Address>
<ns:Addr.Type>Home</ns:Addr.Type>
<ns:Addr.Street>567 3rd Ave</ns:Addr.Street>
<ns:Addr.Location>
<ns:Location>
<ns:Loc.CountryRegion>US </ns:Loc.CountryRegion>
<ns:Loc.State>MI </ns:Loc.State>
<ns:Loc.City>Saginaw</ns:Loc.City>
</ns:Location>
</ns:Addr.Location>
</ns:Address>
</ns:Resume>';
DECLARE #location NVARCHAR(100)=N'Saginaw';--Change this for tests
WITH XMLNAMESPACES(DEFAULT N'http://schemas.microsoft.com/sqlserver/2004/07/adventure-works/Resume')
SELECT r.value(N'(Name/Name.First/text())[1]',N'nvarchar(max)')
,r.value(N'(Name/Name.Last/text())[1]',N'nvarchar(max)')
FROM #xml.nodes(N'/Resume[(Address/Addr.Location/Location/Loc.City/text())[1]=sql:variable("#location")]') AS A(r);