database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-27 12:41:57 +03:00
Code Activity

Add string_agg aggregate functions. The one argument version concatenates

Browse Source 
the input values into a string. The two argument version also does the same
thing, but inserts delimiters between elements.

Original patch by Pavel Stehule, reviewed by David E. Wheeler and me.
This commit is contained in:
Itagaki Takahiro
2010-02-01 03:14:45 +00:00
parent ee3a81f0a0
commit 9ea9918e37
8 changed files with 193 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
doc/src/sgml/func.sgml
View File

@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.498 2010/01/25 20:55:32 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.499 2010/02/01 03:14:43 itagaki Exp $ -->
<chapter id="functions">
<title>Functions and Operators</title>
@ -1789,6 +1789,10 @@
</tgroup>
</table>
<para>
See also <xref linkend="functions-aggregate"> about the aggregate
function <function>string_agg</function>.
</para>
<table id="conversion-names">
<title>Built-in Conversions</title>
@ -9836,6 +9840,25 @@ SELECT NULLIF(value, '(none)') ...
</entry>
</row>
<row>
<entry>
<indexterm>
<primary>string_agg</primary>
</indexterm>
<function>
string_agg(<replaceable class="parameter">expression</replaceable>
[, <replaceable class="parameter">delimiter</replaceable> ] )
</function>
</entry>
<entry>
<type>text</type>
</entry>
<entry>
<type>text</type>
</entry>
<entry>input values concatenated into a string, optionally with delimiters</entry>
</row>
<row>
<entry><function>sum(<replaceable class="parameter">expression</replaceable>)</function></entry>
<entry>