File: sx_h_1.xml

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<?xml version="1.0" encoding="ISO-8859-1"?>
<refentry id="SX-H-1">
  <refmeta>
    <refentrytitle>XML from Data Base Examples</refentrytitle>
    <refmiscinfo>tutorial</refmiscinfo>
  </refmeta>
  <refnamediv>
    <refname>Making a Forest of XML elements by XMLAGG() function</refname>
    <refpurpose>XMLAGG() function</refpurpose>
  </refnamediv>

<refsect1 id="SX-H-1a">
<title>XMLAGG() function. Overview</title>
<para>
XMLAGG is aggregate function that produces a forest of XML elements from the given list of xml elements. 
   It concatenates the values returned from one column of multiple rows, unlike <function>XMLCONCAT</function>, 
   which concatenates the values returned from multiple columns in the same row.
</para>
</refsect1>

<refsect1 id="SX-H-1b">
<title>Example 1</title>
<para>This example produces a forest of all &apos;Name&apos; of the employees having 
the title &apos;Sales Representative&apos; and places it into one top-level element:</para>
<programlisting>
  select XMLELEMENT ('SalesRepresentatives',
    XMLAGG (XMLELEMENT ('Name', "FirstName", ' ', "LastName")) )
    from "Demo"."demo"."Employees"
    where "Title"='Sales Representative';
</programlisting>
</refsect1>

</refentry>