SQL Server For XML Query [closed] - sql

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My table structure is as follows:
date Id Value
--------------------------------
01/01/2005 50000 5
01/01/2006 50000 6
01/01/2007 50000 7
01/01/2005 50001 8
01/01/2006 50001 9
01/01/2007 50001 10
I would like to output the xml using for xml in SQL Server in the following format:
<Date date = "01/01/2005"> <Id dealId=50000" value="5"/> <Id dealId=50001" value="8"/> </Date> <Date date = "01/01/2006"> <Id dealId=50000" value="6"/> <Id dealId=50001" value="9"/> </Date>
It would be of great help if someone can help me out with the query in SQL Server. I have tried couple of them myself but I am not getting the exact output.

Answer 1

-- using your provided values:
DECLARE #table TABLE ([date] DATE, id INT, value INT);
INSERT #Table VALUES ('01/01/2005',50000,5);
INSERT #Table VALUES ('01/01/2006',50000,6);
INSERT #Table VALUES ('01/01/2007',50000,7);
INSERT #Table VALUES ('01/01/2005',50001,8);
INSERT #Table VALUES ('01/01/2006',50001,9);
INSERT #Table VALUES ('01/01/2007',50001,10);
-- XML Query
-- the outer query groups by date, ensuring each date only shows up once
SELECT
[date] AS '#date',
(
-- The inner query selects all Ids for each date found in the outer query
SELECT id as '#dealId',
value as '#value'
FROM #Table B
WHERE B.date=A.date -- join on date from outer query
FOR XML PATH ('Id'), TYPE
)
FROM #Table A
GROUP BY date
FOR XML PATH ('Date');
-- Produces:
<Date date="2005-01-01">
<Id dealId="50000" value="5"/>
<Id dealId="50001" value="8"/>
</Date>
<Date date="2006-01-01">
<Id dealId="50000" value="6"/>
<Id dealId="50001" value="9"/>
</Date>
<Date date="2007-01-01">
<Id dealId="50000" value="7"/>
<Id dealId="50001" value="10"/>
</Date>

Answer 2

Usually, if I need such a simple xml transformation, I'm using for xml raw:
select
t1.[date],
(
select
t2.[Id] as dealId, t2.[Value]
from Table1 as t2
where t2.[date] = t1.[date]
for xml raw('Id'), type
)
from Table1 as t1
group by t1.[date]
for xml raw('Date')
----------------------
<Date date="2005-01-01">
<Id dealId="50000" Value="5"/>
<Id dealId="50001" Value="8"/>
</Date>
<Date date="2006-01-01">
<Id dealId="50000" Value="6"/>
<Id dealId="50001" Value="9"/>
</Date>
<Date date="2007-01-01">
<Id dealId="50000" Value="7"/>
<Id dealId="50001" Value="10"/>
</Date>
Try it yourself in the sql fiddle demo
Some notes:
You don't have to use # in column names, because for xml raw is attribute-centric by default.
Subquery here is necessary, because you want nested xml and for now it's the only way to get it.
You also have to use type modifier in the subquery to get inner data as xml.