File: nm_max_notnull.xml

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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_nm_max_notnull">
  <refmeta>
    <refentrytitle>__max_notnull</refentrytitle>
    <refmiscinfo>number</refmiscinfo>
  </refmeta>
  <refnamediv>
    <refname>__max_notnull</refname>
    <refpurpose>Returns maximum value among all its arguments, ignoring NULLs entirely.</refpurpose>
  </refnamediv>
  <refsynopsisdiv>
    <funcsynopsis id="fsyn___max_notnull">
      <funcprototype id="fproto___max_notnull">
        <funcdef>any <function>__max_notnull</function></funcdef>
	        <paramdef><parameter>arg1</parameter> any</paramdef>
	        <paramdef><parameter>arg2</parameter> any</paramdef>
	        <paramdef><parameter>...</parameter></paramdef>
	        <paramdef><parameter>argN</parameter> any</paramdef>
      </funcprototype>
    </funcsynopsis>
  </refsynopsisdiv>
  <refsect1 id="desc___max_notnull"><title>Description</title>
  <para>The function returns the maximum value among all values in all its arguments by 
  	ignoring NULLs entirely.</para>
  </refsect1>	
  <refsect1 id="params___max_notnull"><title>Parameters</title>
    <refsect2><title>argI</title>
      <para>Values which can be with type float, integer etc.</para></refsect2>
  </refsect1>
  <refsect1 id="examples___max_notnull"><title>Examples</title>
  <example id="ex___max_notnull"><title></title>
<para><emphasis>Example 1</emphasis></para>    
  <screen><![CDATA[
SQL> select __max_notnull (null, 1, 0);
__max_notnull
VARCHAR
_______________________________________________________________________________

1

1 Rows. -- 16 msec.

SQL> select __max (null, 1, 0);
__max
VARCHAR
_______________________________________________________________________________

NULL

1 Rows. -- 0 msec.
]]></screen>
<para><emphasis>Example 2</emphasis></para>    
<programlisting><![CDATA[
SQL> SPARQL 
INSERT INTO GRAPH <http://mygraph.com>
  { 
    <http://mygraph2.com/pricing/#QVal1> <price1>  1 ;                    <price3> 5 .
    <http://mygraph2.com/pricing/#QVal2>                  <price2> 1 ;    <price3> 4 .
    <http://mygraph2.com/pricing/#QVal3> <price1>  6 ;    <price2> 2                 .
  };
    
Insert into <http://mygraph.com>, 6 (or less) triples -- done
No. of rows in result: 1
 	
SQL> SPARQL SELECT ?s, (bif:__max_notnull (?pr1, ?pr2, ?pr3)) 
FROM <http://mygraph.com>
WHERE 
  {
    { 
      SELECT DISTINCT ?s
      WHERE 
        {
          ?s ?p ?pr .
          FILTER (?p in (<price1>, <price2>, <price3>)) 
        } 
    }
    OPTIONAL { ?s <price1> ?pr1 }
    OPTIONAL { ?s <price2> ?pr2 }
    OPTIONAL { ?s <price3> ?pr3 }
  };

  
Query result:
s                                     callret-1
VARCHAR 	                            VARCHAR
_______________________________________________
http://mygraph2.com/pricing/#QVal2	 4
http://mygraph2.com/pricing/#QVal1	 5
http://mygraph2.com/pricing/#QVal3	 6

No. of rows in result: 2   	
]]></programlisting>
  </example>
  </refsect1>
    <refsect1 id="seealso___max_notnull">
    <title>See Also</title>
    <para><link linkend="fn_nm_max"><function>__max()</function></link></para>
    <para><link linkend="fn_nm_min"><function>__min()</function></link></para>
    <para><link linkend="fn_nm_min_notnull"><function>__min_notnull()</function></link></para>
  </refsect1>
</refentry>