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<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/alter_function.sgml,v 1.5 2004/06/25 21:55:50 tgl Exp $
PostgreSQL documentation
-->
<refentry id="SQL-ALTERFUNCTION">
<refmeta>
<refentrytitle id="SQL-ALTERFUNCTION-TITLE">ALTER FUNCTION</refentrytitle>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>ALTER FUNCTION</refname>
<refpurpose>change the definition of a function</refpurpose>
</refnamediv>
<indexterm zone="sql-alterfunction">
<primary>ALTER FUNCTION</primary>
</indexterm>
<refsynopsisdiv>
<synopsis>
ALTER FUNCTION <replaceable>name</replaceable> ( [ <replaceable class="parameter">type</replaceable> [, ...] ] ) RENAME TO <replaceable>newname</replaceable>
ALTER FUNCTION <replaceable>name</replaceable> ( [ <replaceable class="parameter">type</replaceable> [, ...] ] ) OWNER TO <replaceable>newowner</replaceable>
</synopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>
<command>ALTER FUNCTION</command> changes the definition of a
function.
</para>
</refsect1>
<refsect1>
<title>Parameters</title>
<variablelist>
<varlistentry>
<term><replaceable class="parameter">name</replaceable></term>
<listitem>
<para>
The name (optionally schema-qualified) of an existing function.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">type</replaceable></term>
<listitem>
<para>
The data type of an argument of the function.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">newname</replaceable></term>
<listitem>
<para>
The new name of the function.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">newowner</replaceable></term>
<listitem>
<para>
The new owner of the function.
To change the owner of a function, you must be a superuser.
Note that if the function is marked
<literal>SECURITY DEFINER</literal>,
it will subsequently execute as the new owner.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
To rename the function <literal>sqrt</literal> for type
<type>integer</type> to <literal>square_root</literal>:
<programlisting>
ALTER FUNCTION sqrt(integer) RENAME TO square_root;
</programlisting>
</para>
<para>
To change the owner of the function <literal>sqrt</literal> for type
<type>integer</type> to <literal>joe</literal>:
<programlisting>
ALTER FUNCTION sqrt(integer) OWNER TO joe;
</programlisting>
</para>
</refsect1>
<refsect1>
<title>Compatibility</title>
<para>
There is an <command>ALTER FUNCTION</command> statement in the SQL
standard, but it does not provide the option to rename the
function or change the owner.
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<simplelist type="inline">
<member><xref linkend="sql-createfunction" endterm="sql-createfunction-title"></member>
<member><xref linkend="sql-dropfunction" endterm="sql-dropfunction-title"></member>
</simplelist>
</refsect1>
</refentry>
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