1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
<?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_VECTOR_OF_NONNULLS_OR_NULL_AGG">
<refmeta>
<refentrytitle>DB.DBA.VECTOR_OF_NONNULLS_OR_NULL_AGG</refentrytitle>
<refmiscinfo>aggr</refmiscinfo>
</refmeta>
<refnamediv>
<refname>DB.DBA.VECTOR_OF_NONNULLS_OR_NULL_AGG</refname>
<refpurpose>Returns a vector of passed values ingoring NULL arguments.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis id="fsyn_VECTOR_OF_NONNULLS_OR_NULL_AGG">
<funcprototype id="fproto_VECTOR_OF_NONNULLS_OR_NULL_AGG">
<funcdef>vector <function>DB.DBA.VECTOR_OF_NONNULLS_OR_NULL_AGG</function></funcdef>
<paramdef><parameter>value_expression</parameter> any</paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="desc_VECTOR_OF_NONNULLS_OR_NULL_AGG"><title>Description</title>
<para><function>DB.DBA.VECTOR_OF_NONNULLS_OR_NULL_AGG</function> returns a vector of passed values.
Similar to <link linkend="fn_VECTOR_OF_NONNULLS_AGG"><function>DB.DBA.VECTOR_OF_NONNULLS_AGG()</function></link> but returns NULL
instead of an empty vector if no arguments were passed or only NULLs were passed.
</para>
</refsect1>
<refsect1 id="params_VECTOR_OF_NONNULLS_OR_NULL_AGG"><title>Parameters</title>
<refsect2><title>value_expression</title>
<para>Value of item for aggregation.
</para>
</refsect2>
</refsect1>
<refsect1 id="ret_VECTOR_OF_NONNULLS_OR_NULL_AGG"><title>Return Types</title>
<para>Any. If no arguments were passed teturns NULL instead of an empty vector or only NULLs were passed.
</para>
</refsect1>
<refsect1 id="examples_VECTOR_OF_NONNULLS_OR_NULL_AGG"><title>Examples</title>
<example id="ex_VECTOR_OF_NONNULLS_OR_NULL_AGG_1"><title>Simple Use</title>
<para>As the order of items in the vector repeats the order of passing individual values to the aggregate,
it is possible to write, for instance:
</para>
<programlisting><![CDATA[
-- Get an ordered vector of X-es
SELECT DB.DBA.VECTOR_OF_NONNULLS_OR_NULL_AGG (subquery.X)
FROM (SELECT X FROM ... ORDER BY X) as subquery
]]></programlisting>
<para>or</para>
<programlisting><![CDATA[
SELECT DB.DBA.VECTOR_OF_NONNULLS_OR_NULL_AGG (subquery.Y)
FROM (SELECT Y FROM ... ORDER BY X) as subquery
]]></programlisting>
<para>and get vector of Y-s that are ordered by matching values of X-es.</para>
</example>
</refsect1>
<refsect1 id="seealso_VECTOR_OF_NONNULLS_OR_NULL_AGG"><title>See Also</title>
<para><link linkend="fn_XQ_SEQUENCE_AGG"><function>DB.DBA.XQ_SEQUENCE_AGG()</function></link></para>
<para><link linkend="fn_VECTOR_AGG"><function>DB.DBA.VECTOR_AGG()</function></link></para>
<para><link linkend="fn_VECTOR_OF_NONNULLS_AGG"><function>DB.DBA.VECTOR_OF_NONNULLS_AGG()</function></link></para>
<para><link linkend="fn_VECTOR_OR_NULL_AGG"><function>DB.DBA.VECTOR_OR_NULL_AGG()</function></link></para>
<para><link linkend="fn_VECTOR_CONCAT_AGG"><function>DB.DBA.VECTOR_CONCAT_AGG()</function></link></para>
<para><link linkend="fn_BAG_AGG"><function>DB.DBA.BAG_AGG()</function></link></para>
<para><link linkend="fn_BAG_OF_NONNULLS_AGG"><function>DB.DBA.BAG_OF_NONNULLS_AGG()</function></link></para>
<para><link linkend="fn_BAG_OR_NULL_AGG"><function>DB.DBA.BAG_OR_NULL_AGG()</function></link></para>
<para><link linkend="fn_BAG_OF_NONNULLS_OR_NULL_AGG"><function>DB.DBA.BAG_OF_NONNULLS_OR_NULL_AGG()</function></link></para>
<para><link linkend="fn_BAG_CONCAT_AGG"><function>DB.DBA.BAG_CONCAT_AGG()</function></link></para>
<para><link linkend="fn_GROUP_CONCAT"><function>DB.DBA.GROUP_CONCAT()</function></link></para>
<para><link linkend="fn_GROUP_CONCAT_DISTINCT"><function>DB.DBA.GROUP_CONCAT_DISTINCT()</function></link></para>
<para><link linkend="fn_GROUP_DIGEST"><function>DB.DBA.GROUP_DIGEST()</function></link></para>
<para><link linkend="fn_SAMPLE"><function>DB.DBA.SAMPLE()</function></link></para>
</refsect1>
</refentry>
|
