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<?xml version="1.0" encoding="ISO-8859-1"?>
<!--
-
- This file is part of the OpenLink Software Virtuoso Open-Source (VOS)
- project.
-
- Copyright (C) 1998-2018 OpenLink Software
-
- This project is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by the
- Free Software Foundation; only version 2 of the License, dated June 1991.
-
- This program is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License along
- with this program; if not, write to the Free Software Foundation, Inc.,
- 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-
-->
<refentry id="fn_SAMPLE">
<refmeta>
<refentrytitle>DB.DBA.SAMPLE</refentrytitle>
<refmiscinfo>rdf</refmiscinfo>
</refmeta>
<refnamediv>
<refname>DB.DBA.SAMPLE</refname>
<refpurpose>returns an arbitrary value from the multiset passed to it.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis id="fsyn_sample">
<funcprototype id="fproto_sample">
<funcdef><function>DB.DBA.SAMPLE</function></funcdef>
<paramdef>in <parameter>token</parameter> varchar</paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="desc_sample">
<title>Description</title>
<para>DB.DBA.SAMPLE is aggregate function that returns an arbitrary value from the multiset passed to it.</para>
<para>Note: Using the "sql:" prefix is mandatory for this aggregate.</para>
</refsect1>
<refsect1 id="params_sample">
<title>Parameters</title>
<refsect2><title>strg</title>
<para>An item from multiset.</para>
</refsect2>
</refsect1>
<refsect1 id="ret_sample"><title>Return Types</title>
<para>any</para>
</refsect1>
<refsect1 id="examples_sample">
<title>Examples</title>
<example id="ex_sample"><title></title>
<programlisting><![CDATA[
SQL>SPARQL
SELECT (sql:SAMPLE(?nick)), (sql:SAMPLE(?interest))
WHERE
{
?p a foaf:Person .
?p foaf:nick ?nick.
?p foaf:interest ?interest.
}
callret-0 callret-1
VARCHAR VARCHAR
________________________________________________
dr. Jones http://purl.org/rss/1.0/
No. of rows in result: 1
]]></programlisting>
</example>
</refsect1>
<refsect1 id="seealso_sample">
<title>See Also</title>
<para><link linkend="fn_GROUP_CONCAT_DISTINCT"><function>DB.DBA.GROUP_CONCAT_DISTINCT()</function></link></para>
<para><link linkend="fn_GROUP_CONCAT"><function>DB.DBA.GROUP_CONCAT()</function></link></para>
<para><link linkend="fn_GROUP_DIGEST"><function>DB.DBA.GROUP_DIGEST()</function></link></para>
<para><link linkend="samplegroupconcatdigest">Differences between DB.DBA.SAMPLE, DB.DBA.GROUP_CONCAT and
DB.DBA.GROUP_DIGEST functions usage.</link></para>
</refsect1>
</refentry>
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