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Jasbir Luthera

Subject: SQLXML and Subquery
Author: Jasbir Luthera
Date: 04 Apr 2007 01:50 PM

I am trying to do a subquery (which returns exactly one row and one column) to get the value of an attribute, it doesn't work - no error messages:

SELECT XMLELEMENT(name "site",
XMLELEMENT(name "db_id", XMLATTRIBUTES('1-1-1' AS "attr"), t.id),
XMLELEMENT(name "name",
XMLATTRIBUTES((SELECT c.site_id
FROM site c
WHERE c.status = 'active'
AND c.location = 'us'
AND c.state = 'ca') AS "site_id"), t.site_name)
)
FROM plants p

---------------
Output:

<root>
<site>
<db_id attr='1-1-1'>5</db_id >
<site_name>PTP</site_name>
</site>
</root>

PROBLEM: the site_name element should have an attribute called site_id from the respective subquery. See below for subquery results.
-----------------
For subquery:

SELECT c.site_id
FROM site c
WHERE c.status = 'active'
AND c.location = 'us'
AND c.state = 'ca'

Output:
<root>
<row>
<site_id>XYZ</site_id>
</row>
</root>

Ivan Pedruzzi

Subject: SQLXML and Subquery
Author: Ivan Pedruzzi
Date: 04 Apr 2007 02:27 PM

Jasbir

If you are quering either SQL Server, Oracle, DB2, Sybase you should consider using XQuery.

declare variable $site_id := collection('site')/site[
status = 'active' and location = 'us' and state = 'ca']/site_id;

for $plant in collection("plants")
return
<site>
<db_id attr="">{$plan/id}</db_id>
<name site_id="{$site_id}">{$plan/site_name}</name>
</site>

A SQL/XML sub query cannot use XMLATTRIBUTES as root
Here an example of sub query

SELECT
XMLELEMENT(name "row",
XMLELEMENT(name "lname",
(SELECT XMLELEMENT(name "desc", j.job_desc)
FROM pubs.dbo.jobs j
WHERE j.job_id = 1)
,t.lname)
)
FROM pubs.dbo.employee t

Hope this helps
Ivan Pedruzzi
Stylus Studio Team

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