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doc: Additional documentation for date_bin 

Reported-by: Justin Pryzby <pryzby@telsasoft.com>
Author: John Naylor <john.naylor@enterprisedb.com>
Discussion: https://www.postgresql.org/message-id/CAFBsxsEEm1nuhZmfVQxvu_i3nDDEuvNJ_WMrDo9whFD_jusp-A@mail.gmail.com
This commit is contained in:
Peter Eisentraut 2021-04-09 21:55:08 +02:00
parent 41badeaba8
commit 49fb4e6b24
1 changed files with 18 additions and 0 deletions
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doc/src/sgml/func.sgml
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@ -9941,6 +9941,20 @@ SELECT date_trunc('hour', INTERVAL '3 days 02:47:33');
aligned with a specified origin.
</para>
<para>
<synopsis>
date_trunc(<replaceable>stride</replaceable>, <replaceable>source</replaceable>, <replaceable>origin</replaceable>)
</synopsis>
<replaceable>source</replaceable> is a value expression of type
<type>timestamp</type> or <type>timestamp with time zone</type>. (Values
of type <type>date</type> are cast automatically to
<type>timestamp</type>.) <replaceable>stride</replaceable> is a value
expression of type <type> interval</type>. The return value is likewise
of type <type>timestamp</type> or <type>timestamp with time zone</type>,
and it marks the beginning of the bin into which the
<replaceable>source</replaceable> is placed.
</para>
<para>
Examples:
<screen>
@ -9958,6 +9972,10 @@ SELECT date_bin('15 minutes', TIMESTAMP '2020-02-11 15:44:17', TIMESTAMP '2001-0
that <function>date_bin</function> can truncate to an arbitrary interval.
</para>
<para>
Negative intervals are allowed and are treated the same as positive intervals.
</para>
<para>
The <parameter>stride</parameter> interval cannot contain units of month
or larger.