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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>CREATE MATERIALIZED VIEW</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="sql-createlanguage.html" title="CREATE LANGUAGE" /><link rel="next" href="sql-createoperator.html" title="CREATE OPERATOR" /></head><body><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">CREATE MATERIALIZED VIEW</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="sql-createlanguage.html" title="CREATE LANGUAGE">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="sql-commands.html" title="SQL Commands">Up</a></td><th width="60%" align="center">SQL Commands</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 11.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="sql-createoperator.html" title="CREATE OPERATOR">Next</a></td></tr></table><hr></hr></div><div class="refentry" id="SQL-CREATEMATERIALIZEDVIEW"><div class="titlepage"></div><a id="id-1.9.3.71.1" class="indexterm"></a><div class="refnamediv"><h2><span class="refentrytitle">CREATE MATERIALIZED VIEW</span></h2><p>CREATE MATERIALIZED VIEW — define a new materialized view</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">
CREATE MATERIALIZED VIEW [ IF NOT EXISTS ] <em class="replaceable"><code>table_name</code></em>
[ (<em class="replaceable"><code>column_name</code></em> [, ...] ) ]
[ WITH ( <em class="replaceable"><code>storage_parameter</code></em> [= <em class="replaceable"><code>value</code></em>] [, ... ] ) ]
[ TABLESPACE <em class="replaceable"><code>tablespace_name</code></em> ]
AS <em class="replaceable"><code>query</code></em>
[ WITH [ NO ] DATA ]
</pre></div><div class="refsect1" id="id-1.9.3.71.5"><h2>Description</h2><p>
<code class="command">CREATE MATERIALIZED VIEW</code> defines a materialized view of
a query. The query is executed and used to populate the view at the time
the command is issued (unless <code class="command">WITH NO DATA</code> is used) and may be
refreshed later using <code class="command">REFRESH MATERIALIZED VIEW</code>.
</p><p>
<code class="command">CREATE MATERIALIZED VIEW</code> is similar to
<code class="command">CREATE TABLE AS</code>, except that it also remembers the query used
to initialize the view, so that it can be refreshed later upon demand.
A materialized view has many of the same properties as a table, but there
is no support for temporary materialized views or automatic generation of
OIDs.
</p></div><div class="refsect1" id="id-1.9.3.71.6"><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="literal">IF NOT EXISTS</code></span></dt><dd><p>
Do not throw an error if a materialized view with the same name already
exists. A notice is issued in this case. Note that there is no guarantee
that the existing materialized view is anything like the one that would
have been created.
</p></dd><dt><span class="term"><em class="replaceable"><code>table_name</code></em></span></dt><dd><p>
The name (optionally schema-qualified) of the materialized view to be
created.
</p></dd><dt><span class="term"><em class="replaceable"><code>column_name</code></em></span></dt><dd><p>
The name of a column in the new materialized view. If column names are
not provided, they are taken from the output column names of the query.
</p></dd><dt><span class="term"><code class="literal">WITH ( <em class="replaceable"><code>storage_parameter</code></em> [= <em class="replaceable"><code>value</code></em>] [, ... ] )</code></span></dt><dd><p>
This clause specifies optional storage parameters for the new
materialized view; see <a class="xref" href="sql-createtable.html#SQL-CREATETABLE-STORAGE-PARAMETERS" title="Storage Parameters">Storage Parameters</a> for more
information. All parameters supported for <code class="literal">CREATE
TABLE</code> are also supported for <code class="literal">CREATE MATERIALIZED
VIEW</code> with the exception of <code class="literal">OIDS</code>.
See <a class="xref" href="sql-createtable.html" title="CREATE TABLE"><span class="refentrytitle">CREATE TABLE</span></a> for more information.
</p></dd><dt><span class="term"><code class="literal">TABLESPACE <em class="replaceable"><code>tablespace_name</code></em></code></span></dt><dd><p>
The <em class="replaceable"><code>tablespace_name</code></em> is the name
of the tablespace in which the new materialized view is to be created.
If not specified, <a class="xref" href="runtime-config-client.html#GUC-DEFAULT-TABLESPACE">default_tablespace</a> is consulted.
</p></dd><dt><span class="term"><em class="replaceable"><code>query</code></em></span></dt><dd><p>
A <a class="xref" href="sql-select.html" title="SELECT"><span class="refentrytitle">SELECT</span></a>, <a class="link" href="sql-select.html#SQL-TABLE" title="TABLE Command">TABLE</a>,
or <a class="xref" href="sql-values.html" title="VALUES"><span class="refentrytitle">VALUES</span></a> command. This query will run within a
security-restricted operation; in particular, calls to functions that
themselves create temporary tables will fail.
</p></dd><dt><span class="term"><code class="literal">WITH [ NO ] DATA</code></span></dt><dd><p>
This clause specifies whether or not the materialized view should be
populated at creation time. If not, the materialized view will be
flagged as unscannable and cannot be queried until <code class="command">REFRESH
MATERIALIZED VIEW</code> is used.
</p></dd></dl></div></div><div class="refsect1" id="id-1.9.3.71.7"><h2>Compatibility</h2><p>
<code class="command">CREATE MATERIALIZED VIEW</code> is a
<span class="productname">PostgreSQL</span> extension.
</p></div><div class="refsect1" id="id-1.9.3.71.8"><h2>See Also</h2><span class="simplelist"><a class="xref" href="sql-altermaterializedview.html" title="ALTER MATERIALIZED VIEW"><span class="refentrytitle">ALTER MATERIALIZED VIEW</span></a>, <a class="xref" href="sql-createtableas.html" title="CREATE TABLE AS"><span class="refentrytitle">CREATE TABLE AS</span></a>, <a class="xref" href="sql-createview.html" title="CREATE VIEW"><span class="refentrytitle">CREATE VIEW</span></a>, <a class="xref" href="sql-dropmaterializedview.html" title="DROP MATERIALIZED VIEW"><span class="refentrytitle">DROP MATERIALIZED VIEW</span></a>, <a class="xref" href="sql-refreshmaterializedview.html" title="REFRESH MATERIALIZED VIEW"><span class="refentrytitle">REFRESH MATERIALIZED VIEW</span></a></span></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="sql-createlanguage.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="sql-commands.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="sql-createoperator.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">CREATE LANGUAGE </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> CREATE OPERATOR</td></tr></table></div></body></html>
