Cross Apply to get child parent value from Xml in SQL Server

Question

I have the following XML:

<root>
  <row value="US">
    <col value="00">Jon</col>
    <col value="01">David</col>
    <col value="02">Mike</col>
    <col value="03">Nil</col>
  </row>
  <row value="Canada">
    <col value="C1">Pollard</col>
  </row>
  <row value="Japan">
    <col value="J1">Yin</col>
    <col value="J2">Li</col>
  </row>
  <row value="India">
    <col value="MP">Ram</col>
    <col value="UP">Paresh</col>
    <col value="AP">Mohan</col>
  </row>
</root>

and I want the following output by using SQL Server query:

US  00  Jon
US  01  David
US  02  Mike
US  03  Nil
Canada  C1  Pollard
Japan   J1  Yin
Japan   J2  Li
India   MP  Ram
India   UP  Paresh
India   AP  Mohan

I am using following SQL query:

declare @x xml
set @x =
'<root>
  <row value="US">
    <col value="00">Jon</col>
    <col value="01">David</col>
    <col value="02">Mike</col>
    <col value="03">Nil</col>
  </row>
  <row value="Canada">
    <col value="C1">Pollard</col>
  </row>
  <row value="Japan">
    <col value="J1">Yin</col>
    <col value="J2">Li</col>
  </row>
  <row value="India">
    <col value="MP">Ram</col>
    <col value="UP">Paresh</col>
    <col value="AP">Mohan</col>
  </row>
</root>'

select r.value('@value','varchar(100)'),r.value('.','varchar(100)')
from @x.nodes('root') as m(c)
cross apply m.c.nodes('row/col') as x(r)

I am unable to get first column which contains the value of parent row. Can you please suggest what changes I can make to get first column value?

Answer 1

Try this:

select 
    ParentValue = c.value('(../@value)[1]', 'varchar(100)'),
    ValueAttr = c.value('@value','varchar(100)'),
    ColValue = c.value('.','varchar(100)')
from 
    @x.nodes('/root/row/col') as m(c)

Basically, there's really no need to use CROSS APPLY at all - just select the /root/row/col nodes from the .nodes() call, and use ../@value to get the value attribute on the parent node (the <row> element)