SYS_XMLAGG

Syntax

Description of the illustration sys_xmlagg.gif

Purpose

SYS_XMLAgg aggregates all of the XML documents or fragments represented by expr and produces a single XML document. It adds a new enclosing element with a default name ROWSET. If you want to format the XML document differently, then specify fmt, which is an instance of the XMLFormat object.

Examples

The following example uses the SYS_XMLGen function to generate an XML document for each row of the sample table employees where the employee's last name begins with the letter R, and then aggregates all of the rows into a single XML document in the default enclosing element ROWSET:

SELECT SYS_XMLAGG(SYS_XMLGEN(last_name))
   FROM employees
   WHERE last_name LIKE 'R%';

SYS_XMLAGG(SYS_XMLGEN(LAST_NAME))
--------------------------------------------------------------------
<ROWSET>
  <LAST_NAME>Raphaely</LAST_NAME>
  <LAST_NAME>Rogers</LAST_NAME>
  <LAST_NAME>Rajs</LAST_NAME>
  <LAST_NAME>Russell</LAST_NAME>
</ROWSET>