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Postgres FD Implementation
Commit ebfbb79f authored by Thomas G. Lockhart's avatar Thomas G. Lockhart
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Add input parameters for LOCK TABLE. Still needs explanation from Vadim. 

Fix markup.
parent 39fc8139
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doc/src/sgml/ref/lock.sgml
View file @ ebfbb79f
<REFENTRY ID="SQL-LOCK">
<REFMETA>
<REFENTRYTITLE>
<refentry id="SQL-LOCK">
<refmeta>
<refentrytitle>
LOCK
</REFENTRYTITLE>
<REFMISCINFO>SQL - Language Statements</REFMISCINFO>
</REFMETA>
<REFNAMEDIV>
<REFNAME>
</refentrytitle>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>
LOCK
</REFNAME>
<REFPURPOSE>
</refname>
<refpurpose>
Explicit lock of a table inside a transaction
</REFPURPOSE>
</refpurpose>
</refnamediv>
<REFSYNOPSISDIV>
<REFSYNOPSISDIVINFO>
<DATE>1998-09-24</DATE>
</REFSYNOPSISDIVINFO>
<SYNOPSIS>
LOCK [ TABLE ] [IN [ROW|ACCESS] [SHARE|EXCLUSIVE] | [SHARE ROW EXCLUSIVE] MODE]
<REPLACEABLE CLASS="PARAMETER">table</REPLACEABLE>
</SYNOPSIS>
<REFSECT2 ID="R2-SQL-LOCK-1">
<REFSECT2INFO>
<DATE>1998-09-01</DATE>
</REFSECT2INFO>
<TITLE>
<refsynopsisdiv>
<refsynopsisdivinfo>
<date>1998-09-24</date>
</refsynopsisdivinfo>
<synopsis>
LOCK [ TABLE ] <replaceable class="PARAMETER">table</replaceable>
LOCK [ TABLE ] <replaceable class="PARAMETER">table</replaceable> IN [ ROW | ACCESS ] { SHARE | EXCLUSIVE } MODE
LOCK [ TABLE ] <replaceable class="PARAMETER">table</replaceable> IN SHARE ROW EXCLUSIVE MODE
</synopsis>
<refsect2 id="R2-SQL-LOCK-1">
<refsect2info>
<date>1998-09-01</date>
</refsect2info>
<title>
Inputs
</TITLE>
<PARA>
</PARA>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
<REPLACEABLE CLASS="PARAMETER">table</REPLACEABLE>
</TERM>
<LISTITEM>
<PARA>
</title>
<para>
<variablelist>
<varlistentry>
<term>
<replaceable class="PARAMETER">table</replaceable>
</term>
<listitem>
<para>
The name of an existing table to lock.
</para>
</listitem>
</varlistentry>
</VARIABLELIST>
</REFSECT2>
<varlistentry>
<term>
SHARE MODE
</term>
<listitem>
<para>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
EXCLUSIVE MODE
</term>
<listitem>
<para>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
ROW SHARE MODE
</term>
<listitem>
<para>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
ROW EXCLUSIVE MODE
</term>
<listitem>
<para>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
ACCESS SHARE MODE
</term>
<listitem>
<para>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
ACCESS EXCLUSIVE MODE
</term>
<listitem>
<para>
</para>
</listitem>
</varlistentry>
<REFSECT2 ID="R2-SQL-LOCK-2">
<REFSECT2INFO>
<DATE>1998-09-24</DATE>
</REFSECT2INFO>
<TITLE>
<varlistentry>
<term>
SHARE ROW EXCLUSIVE MODE
</term>
<listitem>
<para>
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect2>
<refsect2 id="R2-SQL-LOCK-2">
<refsect2info>
<date>1998-09-24</date>
</refsect2info>
<title>
Outputs
</TITLE>
<PARA>
<VARIABLELIST>
<TERM>
ERROR <REPLACEABLE CLASS="PARAMETER">table</REPLACEABLE>: Table does not exist.
</TERM>
<LISTITEM>
<PARA>
Message returned if <REPLACEABLE CLASS="PARAMETER">table</REPLACEABLE>
</title>
<para>
<variablelist>
<varlistentry>
<term>
ERROR <replaceable class="PARAMETER">table</replaceable>: Table does not exist.
</term>
<listitem>
<para>
Message returned if <replaceable class="PARAMETER">table</replaceable>
does not exist.
</para>
</listitem>
</varlistentry>
</VARIABLELIST>
</variablelist>
</para>
</REFSECT2>
</REFSYNOPSISDIV>
</refsect2>
</refsynopsisdiv>
<REFSECT1 ID="R1-SQL-LOCK-1">
<REFSECT1INFO>
<DATE>1998-09-24</DATE>
</REFSECT1INFO>
<TITLE>
<refsect1 id="R1-SQL-LOCK-1">
<refsect1info>
<date>1998-09-24</date>
</refsect1info>
<title>
Description
</TITLE>
<PARA>
</title>
<para>
By default, <command>LOCK</command> locks in exclusive mode a table inside
a transaction. Various options allow shared access, or row-level locking
control. The classic use for this is
......@@ -112,13 +184,13 @@
</para>
</note>
<REFSECT2 ID="R2-SQL-LOCK-3">
<REFSECT2INFO>
<DATE>1998-09-24</DATE>
</REFSECT2INFO>
<TITLE>
<refsect2 id="R2-SQL-LOCK-3">
<refsect2info>
<date>1998-09-24</date>
</refsect2info>
<title>
Notes
</TITLE>
</title>
<para>
<command>LOCK</command> is a <productname>Postgres</productname>
language extension.
......@@ -134,16 +206,16 @@
</para>
</note>
</para>
</REFSECT2>
</refsect2>
</refsect1>
<REFSECT1 ID="R1-SQL-LOCK-2">
<TITLE>
<refsect1 id="R1-SQL-LOCK-2">
<title>
Usage
</TITLE>
<PARA>
</PARA>
<ProgramListing>
</title>
<para>
</para>
<programlisting>
--Explicit locking to prevent deadlock:
--
BEGIN WORK;
......@@ -152,30 +224,30 @@
UPDATE films SET len = INTERVAL '100 minute'
WHERE len = INTERVAL '117 minute';
COMMIT WORK;
</ProgramListing>
</programlisting>
</REFSECT1>
</refsect1>
<REFSECT1 ID="R1-SQL-LOCK-3">
<TITLE>
<refsect1 id="R1-SQL-LOCK-3">
<title>
Compatibility
</TITLE>
</title>
<REFSECT2 ID="R2-SQL-LOCK-4">
<REFSECT2INFO>
<DATE>1998-09-24</DATE>
</REFSECT2INFO>
<TITLE>
<refsect2 id="R2-SQL-LOCK-4">
<refsect2info>
<date>1998-09-24</date>
</refsect2info>
<title>
SQL92
</TITLE>
<PARA>
</title>
<para>
There is no <command>LOCK TABLE</command> in <acronym>SQL92</acronym>,
which instead uses <command>SET TRANSACTION</command> to specify
concurrency level on transactions. We support that too.
</para>
</refsect2>
</refsect1>
</REFENTRY>
</refentry>
<!-- Keep this comment at the end of the file
Local variables:
......
doc/src/sgml/ref/set.sgml
View file @ ebfbb79f
<REFENTRY ID="SQL-SET">
<REFMETA>
<REFENTRYTITLE>
<refentry id="SQL-SET">
<refmeta>
<refentrytitle>
SET
</REFENTRYTITLE>
<REFMISCINFO>SQL - Language Statements</REFMISCINFO>
</REFMETA>
<REFNAMEDIV>
<REFNAME>
</refentrytitle>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>
SET
</REFNAME>
<REFPURPOSE>
</refname>
<refpurpose>
Set run-time parameters for session
</REFPURPOSE>
</refpurpose>
</refnamediv>
<REFSYNOPSISDIV>
<REFSYNOPSISDIVINFO>
<DATE>1998-09-24</DATE>
</REFSYNOPSISDIVINFO>
<SYNOPSIS>
SET <REPLACEABLE CLASS="PARAMETER">variable</REPLACEABLE> { TO | = } { '<REPLACEABLE CLASS="PARAMETER">value</REPLACEABLE>' | DEFAULT }
SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL };
</SYNOPSIS>
<REFSECT2 ID="R2-SQL-SET-1">
<REFSECT2INFO>
<DATE>1998-09-24</DATE>
</REFSECT2INFO>
<TITLE>
<refsynopsisdiv>
<refsynopsisdivinfo>
<date>1998-09-24</date>
</refsynopsisdivinfo>
<synopsis>
SET <replaceable class="PARAMETER">variable</replaceable> { TO | = } { '<replaceable class="PARAMETER">value</replaceable>' | DEFAULT }
SET TIME ZONE { '<replaceable class="PARAMETER">timezone</replaceable>' | LOCAL | DEFAULT };
SET TRANSACTION ISOLATION LEVEL { READ COMMITTED | SERIALIZED | DEFAULT }
</synopsis>
<refsect2 id="R2-SQL-SET-1">
<refsect2info>
<date>1998-09-24</date>
</refsect2info>
<title>
Inputs
</TITLE>
<PARA>
</title>
<para>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
<REPLACEABLE CLASS="PARAMETER">variable</REPLACEABLE>
</TERM>
<LISTITEM>
<variablelist>
<varlistentry>
<term>
<replaceable class="PARAMETER">variable</replaceable>
</term>
<listitem>
<para>
Settable global parameter.
</para>
......@@ -44,114 +45,152 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
</varlistentry>
<varlistentry>
<term>
<REPLACEABLE CLASS="PARAMETER">value</REPLACEABLE>
<replaceable class="PARAMETER">value</replaceable>
</term>
<listitem>
<PARA>
<para>
New value of parameter.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
<para>
The possible variables and allowed values are:
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
DateStyle
</TERM>
<LISTITEM>
<PARA>
<variablelist>
<varlistentry>
<term>
CLIENT_ENCODING | NAMES
</term>
<listitem>
<para>
Sets the multi-byte client encoding
<variablelist>
<varlistentry>
<term>
<replaceable class="parameter">value</replaceable>
</term>
<listitem>
<para>
Sets the multi-byte client encoding to
<replaceable class="parameter">value</replaceable>.
The specified encoding must be supported by the backend.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
DEFAULT
</term>
<listitem>
<para>
Sets the multi-byte client encoding.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
<para>
This is only enabled if multi-byte was specified to configure.
</para>
</listitem>
</varlistentry>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
<varlistentry>
<term>
DateStyle
</term>
<listitem>
<para>
<variablelist>
<varlistentry>
<term>
ISO
</TERM>
<LISTITEM>
<PARA>
</term>
<listitem>
<para>
use ISO 8601-style dates and times
</para>
</listitem>
</varlistentry>
<VARLISTENTRY>
<TERM>
<varlistentry>
<term>
SQL
</TERM>
<LISTITEM>
<PARA>
</term>
<listitem>
<para>
use Oracle/Ingres-style dates and times
</para>
</listitem>
</varlistentry>
<VARLISTENTRY>
<TERM>
<varlistentry>
<term>
Postgres
</TERM>
<LISTITEM>
<PARA>
</term>
<listitem>
<para>
use traditional <productname>Postgres</productname> format
</para>
</listitem>
</varlistentry>
<VARLISTENTRY>
<TERM>
<varlistentry>
<term>
European
</TERM>
<LISTITEM>
<PARA>
</term>
<listitem>
<para>
use dd/mm/yyyy for numeric date representations.
</para>
</listitem>
</varlistentry>
<VARLISTENTRY>
<TERM>
<varlistentry>
<term>
NonEuropean
</TERM>
<LISTITEM>
<PARA>
</term>
<listitem>
<para>
use mm/dd/yyyy for numeric date representations.
</para>
</listitem>
</varlistentry>
<VARLISTENTRY>
<TERM>
<varlistentry>
<term>
German
</TERM>
<LISTITEM>
<PARA>
</term>
<listitem>
<para>
use dd.mm.yyyy for numeric date representations.
</para>
</listitem>
</varlistentry>
<VARLISTENTRY>
<TERM>
<varlistentry>
<term>
US
</TERM>
<LISTITEM>
<PARA>
</term>
<listitem>
<para>
same as 'NonEuropean'
</para>
</listitem>
</varlistentry>
<VARLISTENTRY>
<TERM>
<varlistentry>
<term>
default
</TERM>
<LISTITEM>
<PARA>
</term>
<listitem>
<para>
restores the default values ('US,Postgres')
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
<para>
Date format initialization my be done by:
<simplelist>
......@@ -180,10 +219,48 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
int DateStyle = USE_ISO_DATES | USE_POSTGRES_DATES | USE_SQL_DATES | USE_GERMAN_DATES
</member>
</simplelist>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
SERVER_ENCODING
</term>
<listitem>
<para>
Sets the multi-byte server encoding
<variablelist>
<varlistentry>
<term>
<replaceable class="parameter">value</replaceable>
</term>
<listitem>
<para>
Sets the multi-byte server encoding.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
DEFAULT
</term>
<listitem>
<para>
Sets the multi-byte server encoding.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
<para>
This is only enabled if multi-byte was specified to configure.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
TIMEZONE
......@@ -257,8 +334,59 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
TRANSACTION ISOLATION LEVEL
</term>
<listitem>
<para>
Sets the isolation level for the current transaction.
<variablelist>
<varlistentry>
<term>
READ COMMITTED
</term>
<listitem>
<para>
The current transaction reads only
committed rows. READ COMMITTED is the default.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
SERIALIZABLE
</term>
<listitem>
<para>
The current transaction will place a
lock on every row read, so later reads in that transaction
see the rows unmodified by other transactions.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
DEFAULT
</term>
<listitem>
<para>
Sets the isolation level for the current transaction to
<option>READ COMMITTED</option>.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
<para>
There are also several internal or optimization
parameters which can be specified
......@@ -301,7 +429,9 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
The frontend may be initialized by setting the PGCOSTHEAP
environment variable.
</para>
<variablelist>
</listitem>
</varlistentry>
<varlistentry>
<term>
COST_INDEX
......@@ -309,10 +439,8 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
<listitem>
<para>
Sets the default cost of an index scan for use by the optimizer.
</para>
</listitem>
</varlistentry>
<variablelist>
<varlistentry>
<term>
<replaceable class="parameter">float4</replaceable>
......@@ -335,15 +463,15 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
</listitem>
</varlistentry>
</variablelist>
</listitem>
</varlistentry>
</variablelist>
</para>
<para>
The frontend may be initialized by setting the PGCOSTINDEX
environment variable.
</para>
</listitem>
</varlistentry>
<variablelist>
<varlistentry>
<term>
GEQO
......@@ -351,12 +479,11 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
<listitem>
<para>
Sets the threshold for using the genetic optimizer algorithm.
</para>
<variablelist>
<varlistentry>
<term>
On
ON
</term>
<listitem>
<para>
......@@ -367,7 +494,7 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
</varlistentry>
<varlistentry>
<term>
On=<replaceable class="parameter">#</replaceable>
ON=<replaceable class="parameter">#</replaceable>
</term>
<listitem>
<para>
......@@ -379,7 +506,7 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
</varlistentry>
<varlistentry>
<term>
Off
OFF
</term>
<listitem>
<para>
......@@ -393,15 +520,13 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
</term>
<listitem>
<para>
Equivalent to specifying <command>SET GEQO='on'</command>
Equivalent to specifying <command>SET GEQO='ON'</command>
</para>
</listitem>
</varlistentry>
</variablelist>
</listitem>
</varlistentry>
</variablelist>
</para>
<para>
This algorithm is on by default, which used GEQO for
statements of eleven or more tables.
......@@ -416,8 +541,10 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
It may be useful when joining big relations with
small ones. This algorithm is off by default.
It's not used by GEQO anyway.
</para>
</listitem>
</varlistentry>
<variablelist>
<varlistentry>
<term>
KSQO
......@@ -427,12 +554,11 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
<firstterm>Key Set Query Optimizer</firstterm> forces the query optimizer
to optimize repetative OR clauses such as generated by
<productname>MicroSoft Access</productname>:
</para>
<variablelist>
<varlistentry>
<term>
On
ON
</term>
<listitem>
<para>
......@@ -443,7 +569,7 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
<varlistentry>
<term>
Off
OFF
</term>
<listitem>
<para>
......@@ -458,15 +584,13 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
</term>
<listitem>
<para>
Equivalent to specifying <command>SET KSQO='off'</command>.
Equivalent to specifying <command>SET KSQO='OFF'</command>.
</para>
</listitem>
</varlistentry>
</variablelist>
</listitem>
</varlistentry>
</variablelist>
</para>
<para>
It may be useful when joining big relations with
small ones. This algorithm is off by default.
......@@ -475,28 +599,21 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
<para>
The frontend may be initialized by setting the PGKSQO
environment variable.
<variablelist>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
QUERY_LIMIT
</term>
<listitem>
<para>
Sets the number of rows returned by a query.
</para>
Sets the maximum number of rows returned by a query.
By default, there is no limit to the number of rows
returned by a query.
<variablelist>
<varlistentry>
<term>
Value
</term>
<listitem>
<para>
Maximum number of rows to return for a query. The default is to allow
an unlimited number of rows.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<replaceable class="parameter">#</replaceable>
......@@ -519,181 +636,61 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
</listitem>
</varlistentry>
</variablelist>
<para>
By default, there is no limit to the number of rows
returned by a query.
</para>
</listitem>
</varlistentry>
</variablelist>
<variablelist>
<varlistentry>
<term>
TRANSACTION ISOLATION LEVEL
</term>
<listitem>
<para>
Sets the isolation level for the current transaction.
<variablelist>
<varlistentry>
<term>
<replaceable class="parameter">value</replaceable>
</term>
<listitem>
<para>
Sets the isolation level for the current transaction to
'SERIALIZABLE' or 'READ COMMITTED'.
SERIALIZABLE means that the current transaction will place a
lock on every row read, so later reads in that transaction
see the rows unmodified by other transactions.
READ COMMITTED means that the current transaction reads only
committed rows. READ COMMITTED is the default.
</para>
</listitem>
</varlistentry>
</para>
<varlistentry>
<term>
DEFAULT
</term>
<listitem>
<para>
Sets the isolation level for the current transaction to
'READ COMMITTED'.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect2>
<variablelist>
<varlistentry>
<term>
CLIENT_ENCODING | NAMES
</term>
<listitem>
<refsect2 id="R2-SQL-SET-2">
<refsect2info>
<date>1998-09-24</date>
</refsect2info>
<title>
Outputs
</title>
<para>
Sets the multi-byte client encoding
<variablelist>
<varlistentry>
<term>
<replaceable class="parameter">value</replaceable>
</term>
<listitem>
<para>
Sets the multi-byte client encoding.
</para>
</listitem>
</varlistentry>
</para>
<varlistentry>
<term>
DEFAULT
<returnvalue>SET VARIABLE</returnvalue>
</term>
<listitem>
<para>
Sets the multi-byte client encoding.
Message returned if successfully.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
<para>
This is only enabled if multi-byte was specified to configure.
</para>
<variablelist>
<varlistentry>
<term>
SERVER_ENCODING
</term>
<listitem>
<para>
Sets the multi-byte server encoding
<variablelist>
<varlistentry>
<term>
<replaceable class="parameter">value</replaceable>
<returnvalue>WARN: Bad value for
<replaceable class="parameter">variable</replaceable>
(<replaceable class="parameter">value</replaceable>)</returnvalue>
</term>
<listitem>
<para>
Sets the multi-byte server encoding.
If the command fails to set the specified variable.
</para>
</listitem>
</varlistentry>
</para>
<varlistentry>
<term>
DEFAULT
</term>
<listitem>
<para>
Sets the multi-byte server encoding.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
<para>
This is only enabled if multi-byte was specified to configure.
</para>
</REFSECT2>
<REFSECT2 ID="R2-SQL-SET-2">
<REFSECT2INFO>
<DATE>1998-09-24</DATE>
</REFSECT2INFO>
<TITLE>
Outputs
</TITLE>
<PARA>
<VARIABLELIST>
<VARLISTENTRY>
<TERM>
<returnvalue>SET VARIABLE</returnvalue>
</TERM>
<LISTITEM>
<PARA>
Message returned if successfully.
</para>
</listitem>
</varlistentry>
<VARLISTENTRY>
<TERM>
<returnvalue>WARN: Bad value for <replaceable class="parameter">variable</replaceable> (<replaceable class="parameter">value</replaceable>)</returnvalue>
</TERM>
<LISTITEM>
<PARA>
If the command fails to set variable.
</para>
</listitem>
</varlistentry>
</VARIABLELIST>
</para>
</REFSECT2>
</REFSYNOPSISDIV>
</refsect2>
</refsynopsisdiv>
<REFSECT1 ID="R1-SQL-SET-1">
<REFSECT1INFO>
<DATE>1998-09-24</DATE>
</REFSECT1INFO>
<TITLE>
<refsect1 id="R1-SQL-SET-1">
<refsect1info>
<date>1998-09-24</date>
</refsect1info>
<title>
Description
</TITLE>
<PARA>
</title>
<para>
<command>SET</command> will modify configuration parameters for variable during
a session.
</para>
......@@ -707,20 +704,20 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
<para>
<command>SET TIME ZONE</command> changes the session's
default time zone offset.
A SQL-session always begins with an initial default time zone
An SQL-session always begins with an initial default time zone
offset.
The <command>SET TIME ZONE</command> statement is used to change the default
time zone offset for the current SQL session.
</para>
<REFSECT2 ID="R2-SQL-SET-3">
<REFSECT2INFO>
<DATE>1998-09-24</DATE>
</REFSECT2INFO>
<TITLE>
<refsect2 id="R2-SQL-SET-3">
<refsect2info>
<date>1998-09-24</date>
</refsect2info>
<title>
Notes
</TITLE>
<PARA>
</title>
<para>
The <command>SET <replaceable class="parameter">variable</replaceable></command>
statement is a <productname>Postgres</productname> language extension.
</para>
......@@ -728,16 +725,16 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
Refer to <command>SHOW</command> and <command>RESET</command> to
display or reset the current values.
</para>
</REFSECT2>
</REFSECT1>
</refsect2>
</refsect1>
<REFSECT1 ID="R1-SQL-SET-2">
<TITLE>
<refsect1 id="R1-SQL-SET-2">
<title>
Usage
</TITLE>
<PARA>
</PARA>
<ProgramListing>
</title>
<para>
</para>
<programlisting>
--Set the style of date to ISO:
--
SET DATESTYLE TO 'ISO';
......@@ -771,25 +768,25 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
today
----------------------
1998-03-31 17:41:31+02
</ProgramListing>
</programlisting>
</REFSECT1>
</refsect1>
<REFSECT1 ID="R1-SQL-SET-3">
<TITLE>
<refsect1 id="R1-SQL-SET-3">
<title>
Compatibility
</TITLE>
<PARA>
</PARA>
<REFSECT2 ID="R2-SQL-SET-4">
<REFSECT2INFO>
<DATE>1998-09-24</DATE>
</REFSECT2INFO>
<TITLE>
</title>
<para>
</para>
<refsect2 id="R2-SQL-SET-4">
<refsect2info>
<date>1998-09-24</date>
</refsect2info>
<title>
SQL92
</TITLE>
<PARA>
</title>
<para>
There is no
<command>SET <replaceable class="parameter">variable</replaceable></command>
in <acronym>SQL92</acronym>.
......@@ -804,7 +801,7 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
</para>
</refsect2>
</refsect1>
</REFENTRY>
</refentry>
<!-- Keep this comment at the end of the file
Local variables:
......
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