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Editorial Team
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Asked: 2026-06-15T01:48:33+00:00

Imagine two tables sites & buildings , where a site may have multiple buildings.

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Imagine two tables sites & buildings, where a site may have multiple buildings. I have a query that generates an xml for geospacial data mapping, and trying to add all buildings that belong to a site, thought using LISTAGG function.

Working query prior to adding buildings

SELECT XMLELEMENT("rss", 
            XMLATTRIBUTES('http://www.georss.org/georss' AS "xmlns:georss"),
                    XMLELEMENT("channel",
                                 XMLAGG(XMLELEMENT("item",
                                                   XMLFOREST(title AS "title",
                                                              description AS "description",
                                                              point AS "georss:point"))))).EXTRACT('/*')
    FROM (SELECT trim(s.sitedesc) AS title, 
          'Employee Count: ' || s.sitefte || '. Bldg Gross SF: ' || s.bldgarea || '. ' || CASE WHEN s.leasestat = '0' THEN 'Owned' WHEN s.leasestat = '1' THEN 'Leased, end date: ' || trim(l.edate) END AS description, 
          trim(s.latitude) || ' ' || trim(s.longitude) AS point
          FROM site s, leases l
          WHERE s.sold <> 1
            AND s.longitude != ' '
            AND s.sitecode = l.sitecode
        )

I can get the LISTAGG function to work on it’s own.

SELECT LISTAGG(trim(b.bldgcode)||' '||trim(b.bldgdesc), ', ') WITHIN GROUP (ORDER BY b.bldgcode) AS Bldgs
FROM buildings b, sites s
WHERE b.sitecode = s.sitecode
GROUP BY s.sitedesc

However the GROUP BY clause throws an error in the xml “not a group by expression” (which I was expecting but can’t seem to fix). Sample below, Is it possible to use LISTAGG within the XMLELEMENT ?

SELECT XMLELEMENT("rss", 
            XMLATTRIBUTES('http://www.georss.org/georss' AS "xmlns:georss"),
                    XMLELEMENT("channel",
                                 XMLAGG(XMLELEMENT("item",
                                                   XMLFOREST(title AS "title",
                                                              description AS "description",
                                                              point AS "georss:point"))))).EXTRACT('/*')
    FROM (SELECT trim(s.sitedesc) AS title, 
          'Employee Count: ' || s.sitefte || '. Bldg Gross SF: ' || s.bldgarea || '. ' || CASE WHEN s.leasestat = '0' THEN 'Owned' WHEN s.leasestat = '1' THEN 'Leased, end date: ' || trim(l.edate) END || LISTAGG(trim(b.bldgcode)||' '||trim(b.bldgdesc), ', ') WITHIN GROUP (ORDER BY b.bldgcode) AS description, 
          trim(s.latitude) || ' ' || trim(s.longitude) AS point
          FROM site s, lease l, buildings b
          WHERE s.sold <> 1
            AND s.longitude != ' '
            AND s.sitecode = l.sitecode
            AND b.sitecode = s.sitecode
          GROUP BY s.sitedesc
        )

Desired XML sample

<rss xmlns:georss="http://www.georss.org/georss">
<channel>
    <item>
        <title>SITE DESCRIPTION</title>
        <description>Employee Count: ###. Bldg Gross SF: ####. Owned/Leased Building1, building2, etc.</description>
        <georss:point>LAT LON</georss:point>
    </item>
....
</channel>
</rss>
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1 Answer

  1. Editorial Team

    change your group by.

    select xmlelement("rss", xmlattributes('http://www.georss.org/georss' as "xmlns:georss"), xmlelement("channel", xmlagg(xmlelement("item", xmlforest(title as "title", description as "description", point as "georss:point")))))
       .extract('/*')
  from (select trim(s.sitedesc) as title,
                'Employee Count: ' || s.sitefte || '. Bldg Gross SF: ' || s.bldgarea || '. ' || case
                  when s.leasestat = '0' then
                   'Owned'
                  when s.leasestat = '1' then
                   'Leased, end date: ' || trim(l.edate)
                end || listagg(trim(b.bldgcode) || ' ' || trim(b.bldgdesc), ', ') within group(order by b.bldgcode) as description,
                trim(s.latitude) || ' ' || trim(s.longitude) as point
           from site s, lease l, buildings b
          where s.sold <> 1
            and s.longitude != ' '
            and s.sitecode = l.sitecode
            and b.sitecode = s.sitecode
          group by s.sitedesc, s.sitefte, s.bldgarea, s.leasestat, l.edate, s.latitude, s.longitude)

    this should then work ok.

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