Getting XML node value and all nested column nodes - sql-server

Question

I have here a small extract of the XML files I will have to handle:
<garRoot fileMaster="9371034.0582.30582">
<garTransactions>
<garTransaction InnerTransId="89274503">
<garSection>
<garSectionCounterFName />
<garColumns />
<garSection>
<garSectionName>Header Section</ChapterName>
<garSectionCounterFName />
<garColumns />
<garSection>
<garSectionName>Startup</ChapterName>
<garSectionCounterFName />
<garColumns>
<garColumn>
<garColText>Idea Date:</garColText>
<garColVal>2017-03-22</garColVal>
</garColumn>
<garColumn>
<garColText>Idea Name:</garColText>
<garColVal>The Invisible Cloak</garColVal>
</garColumn>
</garColumns>
</garSection>
I have tried some code to attempt to:
Start with getting the InnerTransId values for each garTransaction:
SELECT
T.value('./#InnerTransID','varchar(50)') As InnerTransID
FROM #XML.nodes('//garTransaction') AS GarT(T)
Because in reality there have been nested garSection in other garSection I've tried to get all garColText and garColVal via garColumn:
SELECT
C.query('./garColText') As cText
, C.query('./garColVal') As cVal
FROM #XML.nodes('//garColumn') as garC(C)
Where I'm having trouble is, as an example I know I have 145 columns for each transaction id but i cannot seem to link the data together, as I would need to have returned:
InnerTransId cText cVal
--------------- ----------- -------------------
89274503 Idea Date: 2017-03-22
89274503 Idea Name: The Invisible Cloak

Answer 1

You can use CROSS APPLY or OUTER APPLY for that purpose :
SELECT
T.value('#InnerTransID','varchar(50)') As InnerTransID
, C.value('garColText[1]','varchar(max)') As cText
, C.value('garColVal[1]','varchar(max)') As cVal
FROM #XML.nodes('//garTransaction') AS GarT(T)
OUTER APPLY T.nodes('.//garColumn') as garC(C)
Notice how nodes('.//garColumn') was called on T, so that the result, garC(C), only contains garColumn that related to current garTransaction.