codekingpro/portable-devtools

1<?xml version="1.0" encoding="UTF-8" standalone="no"?>2<!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 id="docContent" class="container-fluid col-10"><div 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 16.3 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 /></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">3CREATE MATERIALIZED VIEW [ IF NOT EXISTS ] <em class="replaceable"><code>table_name</code></em>4    [ (<em class="replaceable"><code>column_name</code></em> [, ...] ) ]5    [ USING <em class="replaceable"><code>method</code></em> ]6    [ WITH ( <em class="replaceable"><code>storage_parameter</code></em> [= <em class="replaceable"><code>value</code></em>] [, ... ] ) ]7    [ TABLESPACE <em class="replaceable"><code>tablespace_name</code></em> ]8    AS <em class="replaceable"><code>query</code></em>9    [ WITH [ NO ] DATA ]10</pre></div><div class="refsect1" id="id-1.9.3.71.5"><h2>Description</h2><p>11   <code class="command">CREATE MATERIALIZED VIEW</code> defines a materialized view of12   a query.  The query is executed and used to populate the view at the time13   the command is issued (unless <code class="command">WITH NO DATA</code> is used) and may be14   refreshed later using <code class="command">REFRESH MATERIALIZED VIEW</code>.15  </p><p>16   <code class="command">CREATE MATERIALIZED VIEW</code> is similar to17   <code class="command">CREATE TABLE AS</code>, except that it also remembers the query used18   to initialize the view, so that it can be refreshed later upon demand.19   A materialized view has many of the same properties as a table, but there20   is no support for temporary materialized views.21  </p><p>22   <code class="command">CREATE MATERIALIZED VIEW</code> requires23   <code class="literal">CREATE</code> privilege on the schema used for the materialized24   view.25  </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>26      Do not throw an error if a materialized view with the same name already27      exists. A notice is issued in this case.  Note that there is no guarantee28      that the existing materialized view is anything like the one that would29      have been created.30     </p></dd><dt><span class="term"><em class="replaceable"><code>table_name</code></em></span></dt><dd><p>31      The name (optionally schema-qualified) of the materialized view to be32      created.  The name must be distinct from the name of any other relation33      (table, sequence, index, view, materialized view, or foreign table) in34      the same schema.35     </p></dd><dt><span class="term"><em class="replaceable"><code>column_name</code></em></span></dt><dd><p>36      The name of a column in the new materialized view.  If column names are37      not provided, they are taken from the output column names of the query.38     </p></dd><dt><span class="term"><code class="literal">USING <em class="replaceable"><code>method</code></em></code></span></dt><dd><p>39      This optional clause specifies the table access method to use to store40      the contents for the new materialized view; the method needs be an41      access method of type <code class="literal">TABLE</code>. See <a class="xref" href="tableam.html" title="Chapter 63. Table Access Method Interface Definition">Chapter 63</a> for more information.  If this option is not42      specified, the default table access method is chosen for the new43      materialized view. See <a class="xref" href="runtime-config-client.html#GUC-DEFAULT-TABLE-ACCESS-METHOD">default_table_access_method</a>44      for more information.45     </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>46      This clause specifies optional storage parameters for the new47      materialized view; see48      <a class="xref" href="sql-createtable.html#SQL-CREATETABLE-STORAGE-PARAMETERS" title="Storage Parameters">Storage Parameters</a> in the49      <a class="xref" href="sql-createtable.html" title="CREATE TABLE"><span class="refentrytitle">CREATE TABLE</span></a> documentation for more50      information.  All parameters supported for <code class="literal">CREATE51      TABLE</code> are also supported for <code class="literal">CREATE MATERIALIZED52      VIEW</code>.53      See <a class="xref" href="sql-createtable.html" title="CREATE TABLE"><span class="refentrytitle">CREATE TABLE</span></a> for more information.54     </p></dd><dt><span class="term"><code class="literal">TABLESPACE <em class="replaceable"><code>tablespace_name</code></em></code></span></dt><dd><p>55      The <em class="replaceable"><code>tablespace_name</code></em> is the name56      of the tablespace in which the new materialized view is to be created.57      If not specified, <a class="xref" href="runtime-config-client.html#GUC-DEFAULT-TABLESPACE">default_tablespace</a> is consulted.58     </p></dd><dt><span class="term"><em class="replaceable"><code>query</code></em></span></dt><dd><p>59      A <a class="link" href="sql-select.html" title="SELECT"><code class="command">SELECT</code></a>, <a class="link" href="sql-select.html#SQL-TABLE" title="TABLE Command"><code class="command">TABLE</code></a>,60      or <a class="link" href="sql-values.html" title="VALUES"><code class="command">VALUES</code></a> command.  This query will run within a61      security-restricted operation; in particular, calls to functions that62      themselves create temporary tables will fail.63     </p></dd><dt><span class="term"><code class="literal">WITH [ NO ] DATA</code></span></dt><dd><p>64      This clause specifies whether or not the materialized view should be65      populated at creation time.  If not, the materialized view will be66      flagged as unscannable and cannot be queried until <code class="command">REFRESH67      MATERIALIZED VIEW</code> is used.68     </p></dd></dl></div></div><div class="refsect1" id="id-1.9.3.71.7"><h2>Compatibility</h2><p>69   <code class="command">CREATE MATERIALIZED VIEW</code> is a70   <span class="productname">PostgreSQL</span> extension.71  </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" title="CREATE LANGUAGE">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="sql-commands.html" title="SQL Commands">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="sql-createoperator.html" title="CREATE OPERATOR">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" title="PostgreSQL 16.3 Documentation">Home</a></td><td width="40%" align="right" valign="top"> CREATE OPERATOR</td></tr></table></div></body></html>