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<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/show.sgml,v 1.9 2000/04/08 02:39:02 tgl Exp $
Postgres documentation
-->
<refentry id="SQL-SHOW">
<refmeta>
<refentrytitle id="SQL-SHOW-TITLE">
SHOW
</refentrytitle>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>
SHOW
</refname>
<refpurpose>
Shows run-time parameters for session
</refpurpose>
</refnamediv>
<refsynopsisdiv>
<refsynopsisdivinfo>
<date>1999-07-20</date>
</refsynopsisdivinfo>
<synopsis>
SHOW <replaceable class="PARAMETER">keyword</replaceable>
</synopsis>
<refsect2 id="R2-SQL-SHOW-1">
<refsect2info>
<date>1998-09-24</date>
</refsect2info>
<title>
Inputs
</title>
<para>
<variablelist>
<varlistentry>
<term><replaceable class="PARAMETER">keyword</replaceable></term>
<listitem>
<para>
Refer to
<xref linkend="sql-set-title" endterm="sql-set-title">
for more information on available variables.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect2>
<refsect2 id="R2-SQL-SHOW-2">
<refsect2info>
<date>1998-09-24</date>
</refsect2info>
<title>
Outputs
</title>
<para>
<variablelist>
<varlistentry>
<term><computeroutput>
NOTICE: <replaceable class="PARAMETER">variable</replaceable> is <replaceable>value</replaceable>
</computeroutput></term>
<listitem>
<para>
Message returned if successful.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><computeroutput>
NOTICE: Unrecognized variable <replaceable>value</replaceable>
</computeroutput></term>
<listitem>
<para>
Message returned if <returnvalue>variable</returnvalue> does not exist.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><computeroutput>
NOTICE: Time zone is unknown
</computeroutput></term>
<listitem>
<para>
If the <envar>TZ</envar> or <envar>PGTZ</envar> environment
variable is not set.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect2>
</refsynopsisdiv>
<refsect1 id="R1-SQL-SHOW-1">
<refsect1info>
<date>1998-09-24</date>
</refsect1info>
<title>
Description
</title>
<para>
<command>SHOW</command> will display the current setting of a
run-time parameter during a session.
</para>
<para>
These variables can be set using the <command>SET</command> statement,
and
can be restored to the default values using the <command>RESET</command>
statement.
Parameters and values are case-insensitive.
</para>
<refsect2 id="R2-SQL-SHOW-3">
<refsect2info>
<date>1998-09-24</date>
</refsect2info>
<title>
Notes
</title>
<para>
See also
<xref linkend="sql-set-title" endterm="sql-set-title"> and
<xref linkend="sql-reset-title" endterm="sql-reset-title">
to manipulate variable values.
</para>
</refsect2>
</refsect1>
<refsect1 id="R1-SQL-SHOW-2">
<title>
Usage
</title>
<para>
Show the current <literal>DateStyle</literal> setting:
<programlisting>
SHOW DateStyle;
NOTICE: DateStyle is ISO with US (NonEuropean) conventions
</programlisting>
</para>
<para>
Show the current genetic optimizer (<literal>geqo</literal>) setting:
<programlisting>
SHOW GEQO;
NOTICE: GEQO is ON beginning with 11 relations
</programlisting>
</para>
</refsect1>
<refsect1 id="R1-SQL-SHOW-3">
<title>
Compatibility
</title>
<refsect2 id="R2-SQL-SHOW-4">
<refsect2info>
<date>1998-09-24</date>
</refsect2info>
<title>
SQL92
</title>
<para>
There is no <command>SHOW</command> defined in <acronym>SQL92</acronym>.
</para>
</refsect2>
</refsect1>
</refentry>
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