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150 lines
4.3 KiB
Plaintext
150 lines
4.3 KiB
Plaintext
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$PostgreSQL: pgsql/doc/src/sgml/ref/alter_aggregate.sgml,v 1.10 2008/11/14 10:22:45 petere Exp $
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PostgreSQL documentation
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-->
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<refentry id="SQL-ALTERAGGREGATE">
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<refmeta>
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<refentrytitle id="SQL-ALTERAGGREGATE-TITLE">ALTER AGGREGATE</refentrytitle>
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<manvolnum>7</manvolnum>
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<refmiscinfo>SQL - Language Statements</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>ALTER AGGREGATE</refname>
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<refpurpose>change the definition of an aggregate function</refpurpose>
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</refnamediv>
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<indexterm zone="sql-alteraggregate">
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<primary>ALTER AGGREGATE</primary>
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</indexterm>
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<refsynopsisdiv>
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<synopsis>
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ALTER AGGREGATE <replaceable>name</replaceable> ( <replaceable>type</replaceable> [ , ... ] ) RENAME TO <replaceable>new_name</replaceable>
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ALTER AGGREGATE <replaceable>name</replaceable> ( <replaceable>type</replaceable> [ , ... ] ) OWNER TO <replaceable>new_owner</replaceable>
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ALTER AGGREGATE <replaceable>name</replaceable> ( <replaceable>type</replaceable> [ , ... ] ) SET SCHEMA <replaceable>new_schema</replaceable>
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</synopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>
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<command>ALTER AGGREGATE</command> changes the definition of an
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aggregate function.
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</para>
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<para>
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You must own the aggregate function to use <command>ALTER AGGREGATE</>.
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To change the schema of an aggregate function, you must also have
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<literal>CREATE</literal> privilege on the new schema.
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To alter the owner, you must also be a direct or indirect member of the new
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owning role, and that role must have <literal>CREATE</literal> privilege on
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the aggregate function's schema. (These restrictions enforce that altering
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the owner doesn't do anything you couldn't do by dropping and recreating
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the aggregate function. However, a superuser can alter ownership of any
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aggregate function anyway.)
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</para>
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</refsect1>
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<refsect1>
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<title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><replaceable class="parameter">name</replaceable></term>
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<listitem>
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<para>
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The name (optionally schema-qualified) of an existing aggregate function.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="parameter">type</replaceable></term>
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<listitem>
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<para>
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An input data type on which the aggregate function operates.
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To reference a zero-argument aggregate function, write <literal>*</>
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in place of the list of input data types.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="parameter">new_name</replaceable></term>
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<listitem>
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<para>
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The new name of the aggregate function.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="parameter">new_owner</replaceable></term>
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<listitem>
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<para>
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The new owner of the aggregate function.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="parameter">new_schema</replaceable></term>
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<listitem>
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<para>
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The new schema for the aggregate function.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Examples</title>
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<para>
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To rename the aggregate function <literal>myavg</literal> for type
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<type>integer</type> to <literal>my_average</literal>:
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<programlisting>
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ALTER AGGREGATE myavg(integer) RENAME TO my_average;
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</programlisting>
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</para>
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<para>
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To change the owner of the aggregate function <literal>myavg</literal> for type
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<type>integer</type> to <literal>joe</literal>:
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<programlisting>
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ALTER AGGREGATE myavg(integer) OWNER TO joe;
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</programlisting>
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</para>
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<para>
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To move the aggregate function <literal>myavg</literal> for type
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<type>integer</type> into schema <literal>myschema</literal>:
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<programlisting>
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ALTER AGGREGATE myavg(integer) SET SCHEMA myschema;
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</programlisting>
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</para>
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</refsect1>
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<refsect1>
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<title>Compatibility</title>
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<para>
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There is no <command>ALTER AGGREGATE</command> statement in the SQL
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standard.
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</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<simplelist type="inline">
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<member><xref linkend="sql-createaggregate" endterm="sql-createaggregate-title"></member>
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<member><xref linkend="sql-dropaggregate" endterm="sql-dropaggregate-title"></member>
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</simplelist>
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</refsect1>
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</refentry>
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