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Improve gettimeofday() documentation.

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Karl O. Pinc
This commit is contained in:
Bruce Momjian 2005-06-29 01:52:56 +00:00
parent 0fc9b26098
commit a29d815a7a
1 changed files with 14 additions and 12 deletions
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26
doc/src/sgml/func.sgml
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@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.261 2005/06/28 05:08:50 tgl Exp $
$PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.262 2005/06/29 01:52:56 momjian Exp $
PostgreSQL documentation
-->
@ -5786,15 +5786,6 @@ SELECT LOCALTIMESTAMP;
<function>CURRENT_TIMESTAMP</function>.
</para>
<para>
There is also the function <function>timeofday()</function>, which for historical
reasons returns a <type>text</type> string rather than a <type>timestamp</type> value:
<screen>
SELECT timeofday();
<lineannotation>Result: </lineannotation><computeroutput>Sat Feb 17 19:07:32.000126 2001 EST</computeroutput>
</screen>
</para>
<para>
It is important to know that
<function>CURRENT_TIMESTAMP</function> and related functions return
@ -5803,8 +5794,7 @@ SELECT timeofday();
the intent is to allow a single transaction to have a consistent
notion of the <quote>current</quote> time, so that multiple
modifications within the same transaction bear the same
time stamp. <function>timeofday()</function>
returns the wall-clock time and does advance during transactions.
time stamp.
</para>
<note>
@ -5814,6 +5804,18 @@ SELECT timeofday();
</para>
</note>
<para>
There is also the function <function>timeofday()</function> which
returns the wall-clock time and advances during transactions. For
historical reasons <function>timeofday()</function> returns a
<type>text</type> string rather than a <type>timestamp</type>
value:
<screen>
SELECT timeofday();
<lineannotation>Result: </lineannotation><computeroutput>Sat Feb 17 19:07:32.000126 2001 EST</computeroutput>
</screen>
</para>
<para>
All the date/time data types also accept the special literal value
<literal>now</literal> to specify the current date and time. Thus,