<!--
doc/src/sgml/ref/alter_materialized_view.sgml
PostgreSQL documentation
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<refentry id="sql-altermaterializedview">
 <indexterm zone="sql-altermaterializedview">
  <primary>ALTER MATERIALIZED VIEW</primary>
 </indexterm>

 <refmeta>
  <refentrytitle>ALTER MATERIALIZED VIEW</refentrytitle>
  <manvolnum>7</manvolnum>
  <refmiscinfo>SQL - Language Statements</refmiscinfo>
 </refmeta>

 <refnamediv>
  <refname>ALTER MATERIALIZED VIEW</refname>
  <refpurpose>change the definition of a materialized view</refpurpose>
 </refnamediv>

 <refsynopsisdiv>
<synopsis>
ALTER MATERIALIZED VIEW [ IF EXISTS ] <replaceable class="parameter">name</replaceable>
    <replaceable class="parameter">action</replaceable> [, ... ]
ALTER MATERIALIZED VIEW <replaceable class="parameter">name</replaceable>
    DEPENDS ON EXTENSION <replaceable class="parameter">extension_name</replaceable>
ALTER MATERIALIZED VIEW [ IF EXISTS ] <replaceable class="parameter">name</replaceable>
    RENAME [ COLUMN ] <replaceable class="parameter">column_name</replaceable> TO <replaceable class="parameter">new_column_name</replaceable>
ALTER MATERIALIZED VIEW [ IF EXISTS ] <replaceable class="parameter">name</replaceable>
    RENAME TO <replaceable class="parameter">new_name</replaceable>
ALTER MATERIALIZED VIEW [ IF EXISTS ] <replaceable class="parameter">name</replaceable>
    SET SCHEMA <replaceable class="parameter">new_schema</replaceable>
ALTER MATERIALIZED VIEW ALL IN TABLESPACE <replaceable class="parameter">name</replaceable> [ OWNED BY <replaceable class="parameter">role_name</replaceable> [, ... ] ]
    SET TABLESPACE <replaceable class="parameter">new_tablespace</replaceable> [ NOWAIT ]

<phrase>where <replaceable class="parameter">action</replaceable> is one of:</phrase>

    ALTER [ COLUMN ] <replaceable class="parameter">column_name</replaceable> SET STATISTICS <replaceable class="parameter">integer</replaceable>
    ALTER [ COLUMN ] <replaceable class="parameter">column_name</replaceable> SET ( <replaceable class="parameter">attribute_option</replaceable> = <replaceable class="parameter">value</replaceable> [, ... ] )
    ALTER [ COLUMN ] <replaceable class="parameter">column_name</replaceable> RESET ( <replaceable class="parameter">attribute_option</replaceable> [, ... ] )
    ALTER [ COLUMN ] <replaceable class="parameter">column_name</replaceable> SET STORAGE { PLAIN | EXTERNAL | EXTENDED | MAIN }
    CLUSTER ON <replaceable class="parameter">index_name</replaceable>
    SET WITHOUT CLUSTER
    SET ( <replaceable class="parameter">storage_parameter</replaceable> = <replaceable class="parameter">value</replaceable> [, ... ] )
    RESET ( <replaceable class="parameter">storage_parameter</replaceable> [, ... ] )
    OWNER TO { <replaceable class="parameter">new_owner</replaceable> | CURRENT_USER | SESSION_USER }
</synopsis>
 </refsynopsisdiv>

 <refsect1>
  <title>Description</title>

  <para>
   <command>ALTER MATERIALIZED VIEW</command> changes various auxiliary
   properties of an existing materialized view.
  </para>

  <para>
   You must own the materialized view to use <command>ALTER MATERIALIZED
   VIEW</command>.  To change a materialized view's schema, you must also have
   <literal>CREATE</literal> privilege on the new schema.
   To alter the owner, you must also be a direct or indirect member of the new
   owning role, and that role must have <literal>CREATE</literal> privilege on
   the materialized view's schema.  (These restrictions enforce that altering
   the owner doesn't do anything you couldn't do by dropping and recreating the
   materialized view.  However, a superuser can alter ownership of any view
   anyway.)
  </para>

  <para>
   The <literal>DEPENDS ON EXTENSION</literal> form marks the materialized view
   as dependent on an extension, such that the materialized view will
   automatically be dropped if the extension is dropped.
  </para>

  <para>
   The statement subforms and actions available for
   <command>ALTER MATERIALIZED VIEW</command> are a subset of those available
   for <command>ALTER TABLE</command>, and have the same meaning when used for
   materialized views.  See the descriptions for <xref linkend="sql-altertable"/>
   for details.
  </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 materialized view.
      </para>
     </listitem>
    </varlistentry>

    <varlistentry>
     <term><replaceable class="parameter">column_name</replaceable></term>
     <listitem>
      <para>
       Name of a new or existing column.
      </para>
     </listitem>
    </varlistentry>

    <varlistentry>
     <term><replaceable class="parameter">extension_name</replaceable></term>
     <listitem>
      <para>
       The name of the extension that the materialized view is to depend on.
      </para>
     </listitem>
    </varlistentry>

    <varlistentry>
     <term><replaceable class="parameter">new_column_name</replaceable></term>
     <listitem>
      <para>
       New name for an existing column.
      </para>
     </listitem>
    </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">new_owner</replaceable></term>
    <listitem>
     <para>
      The user name of the new owner of the materialized view.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">new_name</replaceable></term>
    <listitem>
     <para>
      The new name for the materialized view.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">new_schema</replaceable></term>
    <listitem>
     <para>
      The new schema for the materialized view.
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1>

 <refsect1>
  <title>Examples</title>

  <para>
   To rename the materialized view <literal>foo</literal> to
   <literal>bar</literal>:
<programlisting>
ALTER MATERIALIZED VIEW foo RENAME TO bar;
</programlisting></para>
 </refsect1>

 <refsect1>
  <title>Compatibility</title>

  <para>
   <command>ALTER MATERIALIZED VIEW</command> is a
   <productname>PostgreSQL</productname> extension.
  </para>
 </refsect1>

 <refsect1>
  <title>See Also</title>

  <simplelist type="inline">
   <member><xref linkend="sql-creatematerializedview"/></member>
   <member><xref linkend="sql-dropmaterializedview"/></member>
   <member><xref linkend="sql-refreshmaterializedview"/></member>
  </simplelist>
 </refsect1>
</refentry>
