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提交 9640666c 编写于 作者: T Thomas G. Lockhart
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Spiff up discussion of precision on date/time data types. 

Add a NetBSD/alpha and update info on a few other platforms.
上级 2d004d7f
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Showing with 98 addition and 62 deletion
doc/src/sgml/datatype.sgml
浏览文件 @ 9640666c
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/datatype.sgml,v 1.78 2001/12/08 03:24:22 thomas Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/datatype.sgml,v 1.79 2001/12/21 03:54:02 thomas Exp $
-->
<chapter id="datatype">
......@@ -1328,21 +1328,20 @@ SELECT b, char_length(b) FROM test2;
<para>
<type>time</type> and <type>timestamp</type> both accept an
option precision field <replaceable>p</replaceable> which
optional precision field <replaceable>p</replaceable> which
determines the number of digits retained beyond the seconds
decimal point. By default, there is no explicit bound on precision
and the actual precision is determined by the underlying double
precision floating point number used to store values in seconds
for <type>interval</type> and
since 2000-01-01 in the case of <type>timestamp</type>.
in seconds since 2000-01-01 for <type>timestamp</type>.
</para>
<para>
Time zones, and time-zone conventions, are influenced by
political decisions, not just physical effects. Time zones have
become somewhat standardized around the world during the 1900's,
but continue to
be prone to arbitrary changes.
political decisions, not just geometry. Time zones around the
world became somewhat standardized during the 1900's,
but continue to be prone to arbitrary changes.
<productname>PostgreSQL</productname> uses your operating
system's underlying features to provide time-zone
support, and these systems usually contain information for only
......@@ -1354,13 +1353,15 @@ SELECT b, char_length(b) FROM test2;
</para>
<para>
To ensure compatibility to earlier versions of <productname>PostgreSQL</productname>
To ensure compatibility to earlier versions of
<productname>PostgreSQL</productname>
we continue to provide <type>datetime</type>
(equivalent to <type>timestamp</type>) and
<type>timespan</type> (equivalent to <type>interval</type>),
however support for these is now restricted to having an
implicit translation to <type>timestamp</type> and
<type>interval</type>.
<type>interval</type>, and these name mappings will be removed in
the next version.
The types <type>abstime</type>
and <type>reltime</type> are lower precision types which are used internally.
You are discouraged from using any of these types in new
......@@ -1376,9 +1377,12 @@ SELECT b, char_length(b) FROM test2;
Date and time input is accepted in almost any reasonable format, including
<acronym>ISO 8601</acronym>, <acronym>SQL</acronym>-compatible,
traditional <productname>PostgreSQL</productname>, and others.
The ordering of month and day in date input can be ambiguous, therefore a setting
exists to specify how it should be interpreted in ambiguous cases. The command
<literal>SET DateStyle TO 'US'</literal> or <literal>SET DateStyle TO 'NonEuropean'</literal>
For some formats, ordering of month and day in date input can be
ambiguous and there is support for specifying the expected
ordering of these fields.
The command
<literal>SET DateStyle TO 'US'</literal>
or <literal>SET DateStyle TO 'NonEuropean'</literal>
specifies the variant <quote>month before day</quote>, the command
<literal>SET DateStyle TO 'European'</literal> sets the variant
<quote>day before month</quote>. The <literal>ISO</literal> style
......@@ -1386,24 +1390,29 @@ SELECT b, char_length(b) FROM test2;
</para>
<para>
<productname>PostgreSQL</productname> is more flexible in
handling date/time than the
<acronym>SQL</acronym> standard requires.
See <xref linkend="datetime-appendix">
for the exact parsing rules of date/time input and for the recognized time zones.
for the exact parsing rules of date/time input and for the
recognized time zones.
</para>
<para>
Remember that any date or time input needs to be enclosed into
single quotes, like text strings. Refer to <xref
linkend="sql-syntax-constants-generic"> for more information.
Remember that any date or time literal input needs to be enclosed
in single quotes, like text strings. Refer to
<xref linkend="sql-syntax-constants-generic"> for more
information.
<acronym>SQL9x</acronym> requires the following syntax
<synopsis>
<replaceable>type</replaceable> [ (<replaceable>p</replaceable>) ] '<replaceable>value</replaceable>'
</synopsis>
where <replaceable>p</replaceable> is an integer specifying the
number of fractional digits in the seconds field, and is allowed
for <type>time</type>, <type>timestamp</type>, and <type>interval</type> types.
<productname>PostgreSQL</productname> is more flexible in
handling date/time than the
<acronym>SQL</acronym> standard requires.
where <replaceable>p</replaceable> in the optional precision
specification is an integer corresponding to the
number of fractional digits in the seconds field. Precision can
be specified
for <type>time</type>, <type>timestamp</type>, and
<type>interval</type> types.
</para>
<sect3>
......
doc/src/sgml/installation.sgml
浏览文件 @ 9640666c
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/installation.sgml,v 1.70 2001/12/19 18:49:56 petere Exp $ -->
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/installation.sgml,v 1.71 2001/12/21 03:54:02 thomas Exp $ -->
<chapter id="installation">
<title><![%standalone-include[<productname>PostgreSQL</>]]>
......@@ -1372,9 +1372,10 @@ gunzip -c user.ps.gz \
<entry><systemitem class="osname">AIX</></entry>
<entry><systemitem>RS6000</></entry>
<entry>7.2</entry>
<entry>2001-11-28,
Andreas Zeugswetter (<email>ZeugswetterA@spardat.at</email>)</entry>
<entry>4.3; see also <filename>doc/FAQ_AIX</filename></entry>
<entry>2001-12-19,
Andreas Zeugswetter (<email>ZeugswetterA@spardat.at</email>),
Tatsuo Ishii (<email>t-ishii@sra.co.jp</email>)</entry>
<entry>see also <filename>doc/FAQ_AIX</filename></entry>
</row>
<row>
<entry><systemitem class="osname">BeOS</></entry>
......@@ -1392,6 +1393,14 @@ gunzip -c user.ps.gz \
Bruce Momjian (<email>pgman@candle.pha.pa.us</email>)</entry>
<entry>4.2</entry>
</row>
<row>
<entry><systemitem class="osname">FreeBSD</></entry>
<entry><systemitem>Alpha</></entry>
<entry>7.2</entry>
<entry>2001-12-18,
Chris Kings-Lynne (<email>chriskl@familyhealth.com.au</email>)</entry>
<entry></entry>
</row>
<row>
<entry><systemitem class="osname">FreeBSD</></entry>
<entry><systemitem>x86</></entry>
......@@ -1428,9 +1437,9 @@ gunzip -c user.ps.gz \
<row>
<entry><systemitem class="osname">Linux</></entry>
<entry><systemitem>armv4l</></entry>
<entry>7.1</entry>
<entry>2001-02-22,
Mark Knox (<email>markk@pixin.net</email>)</entry>
<entry>7.2</entry>
<entry>2001-12-10,
Mark Knox (<email>segfault@hardline.org</email>)</entry>
<entry>2.2.x</entry>
</row>
<row>
......@@ -1441,6 +1450,14 @@ gunzip -c user.ps.gz \
Hisao Shibuya (<email>shibuya@alpha.or.jp</>)</entry>
<entry>2.0.x; <productname>Cobalt Qube2</></entry>
</row>
<row>
<entry><systemitem class="osname">Linux</></entry>
<entry><systemitem>PlayStation2</></entry>
<entry>7.2</entry>
<entry>2001-12-12,
Permaine Cheung <email>pcheung@redhat.com</email>)</entry>
<entry>#undef HAS_TEST_AND_SET, slock_t</entry>
</row>
<row>
<entry><systemitem class="osname">Linux</></entry>
<entry><systemitem>PPC74xx</></entry>
......@@ -1452,9 +1469,9 @@ gunzip -c user.ps.gz \
<row>
<entry><systemitem class="osname">Linux</></entry>
<entry><systemitem>S/390</></entry>
<entry>7.1</entry>
<entry>2000-11-17,
Neale Ferguson (<email>Neale.Ferguson@softwareAG-usa.com</email>)</entry>
<entry>7.2</entry>
<entry>2001-12-12,
Permaine Cheung <email>pcheung@redhat.com</email>)</entry>
<entry></entry>
</row>
<row>
......@@ -1565,11 +1582,20 @@ gunzip -c user.ps.gz \
<row>
<entry><systemitem class="osname">QNX 4.25</></entry>
<entry><systemitem>x86</></entry>
<entry>7.1</entry>
<entry>2001-05-24,
<entry>7.2</entry>
<entry>2001-12-10,
Bernd Tegge (<email>tegge@repas-aeg.de</email>)
</entry>
<entry>see also <filename>doc/FAQ_QNX4</filename></entry>
</row>
<row>
<entry><systemitem class="osname">QNX 6</></entry>
<entry><systemitem>x86</></entry>
<entry>7.2</entry>
<entry>2001-12-10,
Igor Kovalenko (<email>Igor.Kovalenko@motorola.com</email>)
</entry>
<entry>Requires patches for Posix semaphores; see archives</entry>
</row>
<row>
<entry><systemitem class="osname">Solaris</></entry>
......@@ -1587,22 +1613,43 @@ gunzip -c user.ps.gz \
Martin Renters (<email>martin@datafax.com</email>)</entry>
<entry>2.8; see also <filename>doc/FAQ_Solaris</filename></entry>
</row>
<row>
<entry><systemitem class="osname">SunOS</></entry>
<entry><systemitem>Sparc</></entry>
<entry>7.2</entry>
<entry>2001-12-04, Tatsuo Ishii (<email>t-ishii@sra.co.jp</email>)</entry>
<entry></entry>
</row>
<row>
<entry><systemitem class="osname">Tru64 UNIX</></entry>
<entry><systemitem>Alpha</></entry>
<entry>7.2</entry>
<entry>2001-11-26,
Alessio Bragadini (<email>alessio@albourne.com</email>)</entry>
<entry>4.0g, with cc and gcc</entry>
Alessio Bragadini (<email>alessio@albourne.com</email>),
Bernd Tegge (<email>tegge@repas-aeg.de</email>)</entry>
<entry>5.0; 4.0g with cc and gcc</entry>
</row>
<row>
<entry><systemitem class="osname">Windows NT/2000</></entry>
<entry><systemitem class="osname">Windows</></entry>
<entry><systemitem>x86</></entry>
<entry>7.1</entry>
<entry>2001-03-16,
<entry>7.2</entry>
<entry>2001-12-13,
Dave Page (<email>dpage@vale-housing.co.uk</email>),
Jason Tishler (<email>jason@tishler.net</email>)</entry>
<entry>with <application>Cygwin</application> tool set, see <filename>doc/FAQ_MSWIN</filename></entry>
<entry>with <application>Cygwin</application>; see <filename>doc/FAQ_MSWIN</filename></entry>
</row>
<row>
<entry><systemitem class="osname">Windows</></entry>
<entry><systemitem>x86</></entry>
<entry>7.2</entry>
<entry>2001-12-10,
Dave Page (<email>dpage@vale-housing.co.uk</email>)</entry>
<entry>
native is client-side only;
<![%standalone-include[see Administrator's Guide]]>
<![%standalone-ignore[see <xref linkend="install-win32">]]>
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
......@@ -1668,14 +1715,7 @@ Obsolete platform? This distro was merged into PPC afaik. - thomas 2001-12-07
<entry><systemitem>x86</></entry>
<entry>6.5</entry>
<entry>1999-05-25, Andrew Merrill (<email>andrew@compclass.com</>)</entry>
<entry>7.2 should work, but no reports; see also <filename>doc/FAQ_SCO</filename></entry>
</row>
<row>
<entry><systemitem class="osname">SunOS</></entry>
<entry><systemitem>Sparc</></entry>
<entry>7.2</entry>
<entry>2001-12-04, Tatsuo Ishii (<email>t-ishii@sra.co.jp</email>)</entry>
<entry><function>memcmp()</> does not work correctly, so probably not reliable</entry>
<entry>&version; should work, but no reports; see also <filename>doc/FAQ_SCO</filename></entry>
</row>
<row>
<entry><systemitem class="osname">System V R4</></entry>
......@@ -1703,24 +1743,11 @@ Obsolete platform? This distro was merged into PPC afaik. - thomas 2001-12-07
<entry><systemitem>VAX</></entry>
<entry>6.x</entry>
<entry>1998-03-01</entry>
<entry>no recent reports</entry>
</row>
<row>
<entry><systemitem class="osname">Windows 9x, ME, NT, 2000</> (native)</entry>
<entry><systemitem>x86</></entry>
<entry>7.1</entry>
<entry>2001-03-26, Magnus Hagander (<email>mha@sollentuna.net</email>)</entry>
<entry>
client-side libraries (<application>libpq</> and <application>psql</>) or ODBC or JDBC, no server-side;
<![%standalone-include[see <citetitle>Administrator's Guide</>]]>
<![%standalone-ignore[see <xref linkend="install-win32">]]>
for instructions
</entry>
<entry></entry>
</row>
</tbody>
</tgroup>
</informaltable>
</sect1>
</chapter>
......
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