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<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/rollback.sgml,v 1.13 2002/05/18 15:44:47 petere Exp $
PostgreSQL documentation
-->
<refentry id="SQL-ROLLBACK">
<refmeta>
<refentrytitle id="SQL-ROLLBACK-TITLE">ROLLBACK</refentrytitle>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>
ROLLBACK
</refname>
<refpurpose>
abort the current transaction
</refpurpose>
</refnamediv>
<refsynopsisdiv>
<refsynopsisdivinfo>
<date>1999-07-20</date>
</refsynopsisdivinfo>
<synopsis>
ROLLBACK [ WORK | TRANSACTION ]
</synopsis>
<refsect2 id="R2-SQL-ROLLBACK-1">
<refsect2info>
<date>1998-09-24</date>
</refsect2info>
<title>
Inputs
</title>
<para>
None.
</para>
</refsect2>
<refsect2 id="R2-SQL-ROLLBACK-2">
<refsect2info>
<date>1998-09-24</date>
</refsect2info>
<title>
Outputs
</title>
<para>
<variablelist>
<varlistentry>
<term><computeroutput>
ROLLBACK
</computeroutput></term>
<listitem>
<para>
Message returned if successful.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><computeroutput>
WARNING: ROLLBACK: no transaction in progress
</computeroutput></term>
<listitem>
<para>
If there is not any transaction currently in progress.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect2>
</refsynopsisdiv>
<refsect1 id="R1-SQL-ROLLBACK-1">
<refsect1info>
<date>1998-09-24</date>
</refsect1info>
<title>
Description
</title>
<para>
<command>ROLLBACK</command> rolls back the current transaction and causes
all the updates made by the transaction to be discarded.
</para>
<refsect2 id="R2-SQL-ROLLBACK-3">
<refsect2info>
<date>1998-09-24</date>
</refsect2info>
<title>
Notes
</title>
<para>
Use <xref linkend="SQL-COMMIT" endterm="SQL-COMMIT-TITLE">
to successfully terminate a transaction.
<xref linkend="SQL-ABORT" endterm="SQL-ABORT-TITLE"> is a
synonym for <command>ROLLBACK</command>.
</para>
</refsect2>
</refsect1>
<refsect1 id="R1-SQL-ROLLBACK-2">
<title>
Usage
</title>
<para>
To abort all changes:
<programlisting>
ROLLBACK WORK;
</programlisting>
</para>
</refsect1>
<refsect1 id="R1-SQL-ROLLBACK-3">
<title>
Compatibility
</title>
<refsect2 id="R2-SQL-ROLLBACK-4">
<refsect2info>
<date>1998-09-24</date>
</refsect2info>
<title>
SQL92
</title>
<para>
<acronym>SQL92</acronym> only specifies the two forms <literal>ROLLBACK</literal>
and <literal>ROLLBACK WORK</literal>. Otherwise full compatibility.
</para>
</refsect2>
</refsect1>
</refentry>
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