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<h1>22. Virtuoso Functions Guide - XMLAGG</h1>
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<div id="text">
<h2>XMLAGG</h2>
<div class="refpurpose">Produces a forest of elements from a collection of XML values</div>
<div class="funcsynopsis">
<span class="funcdef">vector <span class="function">XMLAGG</span>
</span>
(<span class="paramdef">
<span class="parameter">value_expression</span> any</span>);
</div>
<div class="refsect1">
<div class="refsect1title">Description</div>
<p>
<span class="computeroutput">XMLAGG</span> 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 <span class="computeroutput">XMLCONCAT</span>,
which concatenates the values returned from multiple columns in the same row.
</p>
<p>
The order of element in the result of <span class="computeroutput">XMLAGG</span> is defined by the order of retrieval of the source data rows.
It is important to remember that the order of rows in an SQL resultset defined only if there's an explicit ORDER BY clause.
Hence if the order of elements in the resulting forest is important then XMLAGG should be applied to data that comes from
inner SELECT statement that has an ORDER BY clause, not e.g. from a table reference.
</p>
<p>
Note that <span class="computeroutput">XMLAGG</span> is actually declared as <span class="computeroutput">DB.DBA.XMLAGG</span>
but it is not important for plain use:
for compatibility with other systems, any call of <span class="computeroutput">XMLAGG</span> in any SQl statement
is always replaced with the call of <span class="computeroutput">DB.DBA.XMLAGG</span>, no matter
which qualifier and user name are in use.
</p>
</div>
<div class="refsect1">
<div class="refsect1title">Parameters</div>
<div class="refsect2">
<span class="refsect2title">value_expression – </span>
the result of one of the following functions <span class="computeroutput">XMLAGG</span>,
<span class="computeroutput">XMLCONCAT</span>, <span class="computeroutput">XMLELEMENT</span>, or <span class="computeroutput">XMLFOREST</span>.
</div>
</div>
<div class="refsect1">
<div class="refsect1title">Parameters</div>
<p>The aggregate returns a vector that is a suitable input for functions <span class="computeroutput">XMLELEMENT</span>,
<span class="computeroutput">XMLCONCAT</span> and <span class="computeroutput">xml_tree_doc</span>.
</p>
</div>
<div class="refsect1">
<div class="refsect1title">Examples</div>
<a name="ex_XMLAGG_1" />
<div class="example">
<div class="exampletitle">XMLAGG() enclosed in XMLELEMENT()</div>
<p>
The following example produces an 'Emp' element with attribute 'Title'
and a list of all employees having
the title 'Sales Representative' as element content.
</p>
<div>
<pre class="screen">
select XMLELEMENT ('Emp', XMLATTRIBUTES ('Sales Representative' as "Title"),
XMLAGG (XMLELEMENT ('Name', "FirstName", ' ', "LastName")))
from "Demo"."demo"."Employees"
where "Title" = 'Sales Representative';
callret
VARCHAR
_______________________________________________________________________________
<Emp Title="Sales Representative">
<Name>Nancy Davolio</Name>
<Name>Janet Leverling</Name>
<Name>Margaret Peacock</Name>
<Name>Michael Suyama</Name>
<Name>Robert King</Name>
<Name>Anne Dodsworth</Name>
</Emp>
1 Rows.
</pre>
</div>
</div>
<a name="ex_XMLAGG_2" />
<div class="example">
<div class="exampletitle">XMLAGG() that produces a sorted document</div>
<p>
The result of the previous example contains an unsorted list of names.
This is because data rows were retrieved from "Demo"."demo"."Employees"
in primary key order, and this order has nothing common with fields "FirstName" and "LastName".
To produce the sorted result, the query should contain ORDER BY in a subquery.
These two variants will work identically if "FirstName" never contains whitespaces
or nonprintable control characters, but the last one is formally more correct.
</p>
<div>
<pre class="screen">
select XMLELEMENT ('Emp', XMLATTRIBUTES ('Sales Representative' as "Title"),
XMLAGG (XMLELEMENT ('Name', "FirstName", ' ', "LastName")))
from
(select "FirstName", "LastName"
from "Demo"."demo"."Employees"
where "Title"= 'Sales Representative'
order by 1, 2) as subq;
callret
VARCHAR
_______________________________________________________________________________
<Emp Title="Sales Representative">
<Name>Anne Dodsworth</Name>
<Name>Janet Leverling</Name>
<Name>Margaret Peacock</Name>
<Name>Michael Suyama</Name>
<Name>Nancy Davolio</Name>
<Name>Robert King</Name>
</Emp>
1 Rows.
select XMLELEMENT ('Emp', XMLATTRIBUTES ('Sales Representative' as "Title"),
XMLAGG (XMLELEMENT ('Name', full_name)))
from
(select concat ("FirstName", ' ', "LastName") as full_name
from "Demo"."demo"."Employees"
where "Title"= 'Sales Representative'
order by 1) as subq;
callret
VARCHAR
_______________________________________________________________________________
<Emp Title="Sales Representative">
<Name>Anne Dodsworth</Name>
<Name>Janet Leverling</Name>
<Name>Margaret Peacock</Name>
<Name>Michael Suyama</Name>
<Name>Nancy Davolio</Name>
<Name>Robert King</Name>
</Emp>
1 Rows.
</pre>
</div>
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<div class="refsect1title">See Also</div>
<p>
<a href="fn_XMLELEMENT.html">XMLELEMENT()</a>
</p>
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<a href="fn_XMLATTRIBUTES.html">XMLATTRIBUTES()</a>
</p>
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<a href="fn_XMLFOREST.html">XMLFOREST()</a>
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<a href="fn_XMLCONCAT.html">XMLCONCAT()</a>
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