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<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/rollback.sgml,v 1.18 2004-08-01 17:32:13 tgl 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>
<indexterm zone="sql-rollback">
<primary>ROLLBACK</primary>
</indexterm>
<refsynopsisdiv>
<synopsis>
ROLLBACK [ WORK | TRANSACTION ]
</synopsis>
</refsynopsisdiv>
<refsect1>
<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>
</refsect1>
<refsect1>
<title>Parameters</title>
<variablelist>
<varlistentry>
<term><literal>WORK</literal></term>
<term><literal>TRANSACTION</literal></term>
<listitem>
<para>
Optional key words. They have no effect.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Notes</title>
<para>
Use <xref linkend="SQL-COMMIT" endterm="SQL-COMMIT-TITLE"> to
successfully terminate a transaction.
</para>
<para>
Issuing <command>ROLLBACK</> when not inside a transaction does
no harm, but it will provoke a warning message.
</para>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
To abort all changes:
<programlisting>
ROLLBACK;
</programlisting>
</para>
</refsect1>
<refsect1>
<title>Compatibility</title>
<para>
The SQL standard only specifies the two forms
<literal>ROLLBACK</literal> and <literal>ROLLBACK
WORK</literal>. Otherwise, this command is fully conforming.
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<simplelist type="inline">
<member><xref linkend="sql-begin" endterm="sql-begin-title"></member>
<member><xref linkend="sql-commit" endterm="sql-commit-title"></member>
<member><xref linkend="sql-rollback-to" endterm="sql-rollback-to-title"></member>
</simplelist>
</refsect1>
</refentry>
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sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
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sgml-default-dtd-file:"../reference.ced"
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sgml-local-catalogs:"/usr/lib/sgml/catalog"
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-->
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