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- new to_char(interval, text)

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- new millisecond (ms) and microsecond (us) support
 - more robus parsing from string - used is separator checking for
   non-exact formats like to_date('2001-9-1', 'YYYY-MM-DD')
 - SGML docs are included

Karel Zak
This commit is contained in:
Bruce Momjian
2001-09-06 03:22:42 +00:00
parent 74dde13e2c
commit 2a34134b6c
6 changed files with 477 additions and 308 deletions
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33
doc/src/sgml/func.sgml
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@ -1,4 +1,4 @@
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/func.sgml,v 1.68 2001/08/31 07:45:09 ishii Exp $ -->
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/func.sgml,v 1.69 2001/09/06 03:22:41 momjian Exp $ -->
<chapter id="functions">
<title>Functions and Operators</title>
@ -1564,6 +1564,12 @@
<entry>convert timestamp to string</entry>
<entry>to_char(timestamp 'now','HH12:MI:SS')</entry>
</row>
<row>
<entry>to_char(interval, text)</entry>
<entry>text</entry>
<entry>convert interval to string</entry>
<entry>to_char(interval '15h 2m 12s','HH24:MI:SS')</entry>
</row>
<row>
<entry>to_char(int, text)</entry>
<entry>text</entry>
@ -1645,6 +1651,14 @@
<entry>SS</entry>
<entry>second (00-59)</entry>
</row>
<row>
<entry>MS</entry>
<entry>millisecond (000-999)</entry>
</row>
<row>
<entry>US</entry>
<entry>microsecond (000000-999999)</entry>
</row>
<row>
<entry>SSSS</entry>
<entry>seconds past midnight (0-86399)</entry>
@ -1911,6 +1925,23 @@
<literal>to_date('20000Nov31', 'YYYYMonDD')</literal>.
</para>
</listitem>
<listitem>
<para>
Millisecond <literal>MS</literal> and microcesond <literal>US</literal>
values are in conversion from string to timestamp used as part of
second after decimal point. For example
<literal>to_timestamp('12:3', 'SS:MS')</literal> is not 3 milliseconds,
but 300, because the conversion count it as <literal>12 + 0.3</literal>.
It means for format 'SS:MS' is '12:3' or '12:30' or '12:300' same
number of miliceconds. For the three milliseconds must be used
'12:003' that the counversion count as
<literal> 12 + 0.003 = 12.003 seconds </literal>. Here is a more
complex example:
<literal>to_timestamp('15:12:02.020.001230','HH:MI:SS.MS.US')</literal>
is 15 hours, 12 minutes, 2.021230 seconds.
</para>
</listitem>
</itemizedlist>
</para>