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    <title>CREATE MATERIALIZED VIEW &#8212; Trino 444 Documentation</title>
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  <section id="create-materialized-view">
<h1 id="sql-create-materialized-view--page-root">CREATE MATERIALIZED VIEW<a class="headerlink" href="#sql-create-materialized-view--page-root" title="Permalink to this heading">#</a></h1>
<section id="synopsis">
<h2 id="synopsis">Synopsis<a class="headerlink" href="#synopsis" title="Permalink to this heading">#</a></h2>
<div class="highlight-text notranslate"><div class="highlight"><pre><span></span>CREATE [ OR REPLACE ] MATERIALIZED VIEW
[ IF NOT EXISTS ] view_name
[ GRACE PERIOD interval ]
[ COMMENT string ]
[ WITH properties ]
AS query
</pre></div>
</div>
</section>
<section id="description">
<h2 id="description">Description<a class="headerlink" href="#description" title="Permalink to this heading">#</a></h2>
<p>Create and validate the definition of a new materialized view <code class="docutils literal notranslate"><span class="pre">view_name</span></code> of a
<a class="reference internal" href="select.html"><span class="doc">SELECT</span></a> <code class="docutils literal notranslate"><span class="pre">query</span></code>. You need to run the <a class="reference internal" href="refresh-materialized-view.html"><span class="doc">REFRESH MATERIALIZED VIEW</span></a>
statement after the creation to populate the materialized view with data. This
materialized view is a physical manifestation of the query results at time of
refresh. The data is stored, and can be referenced by future queries.</p>
<p>Queries accessing materialized views are typically faster than retrieving data
from a view created with the same query. Any computation, aggregation, and other
operation to create the data is performed once during refresh of the
materialized views, as compared to each time of accessing the view. Multiple
reads of view data over time, or by multiple users, all trigger repeated
processing. This is avoided for materialized views.</p>
<p>The optional <code class="docutils literal notranslate"><span class="pre">OR</span> <span class="pre">REPLACE</span></code> clause causes the materialized view to be replaced
if it already exists rather than raising an error.</p>
<p>The optional <code class="docutils literal notranslate"><span class="pre">IF</span> <span class="pre">NOT</span> <span class="pre">EXISTS</span></code> clause causes the materialized view only to be
created if it does not exist yet.</p>
<p>Note that <code class="docutils literal notranslate"><span class="pre">OR</span> <span class="pre">REPLACE</span></code> and <code class="docutils literal notranslate"><span class="pre">IF</span> <span class="pre">NOT</span> <span class="pre">EXISTS</span></code> are mutually exclusive clauses.</p>
<p id="mv-grace-period">The optional <code class="docutils literal notranslate"><span class="pre">GRACE</span> <span class="pre">PERIOD</span></code> clause specifies how long the query materialization
is used for querying:</p>
<ul class="simple">
<li><p>Within the grace period since last refresh, data retrieval is highly
performant because the query materialization is used. However, the data may
not be up to date with the base tables.</p></li>
<li><p>After the grace period has elapsed, the data of the materialized view is
computed on-the-fly using the <code class="docutils literal notranslate"><span class="pre">query</span></code>. Retrieval is therefore slower, but the
data is up to date with the base tables.</p></li>
<li><p>If not specified, the grace period defaults to infinity, and therefore all
queries are within the grace period.</p></li>
<li><p>Every <a class="reference internal" href="refresh-materialized-view.html"><span class="doc std std-doc">REFRESH MATERIALIZED VIEW</span></a> operation resets the start time for the
grace period.</p></li>
</ul>
<p>The optional <code class="docutils literal notranslate"><span class="pre">COMMENT</span></code> clause causes a <code class="docutils literal notranslate"><span class="pre">string</span></code> comment to be stored with
the metadata about the materialized view. The comment is displayed with the
<a class="reference internal" href="show-create-materialized-view.html"><span class="doc">SHOW CREATE MATERIALIZED VIEW</span></a> statement and is available in the table
<code class="docutils literal notranslate"><span class="pre">system.metadata.materialized_view_properties</span></code>.</p>
<p>The optional <code class="docutils literal notranslate"><span class="pre">WITH</span></code> clause is used to define properties for the materialized
view creation. Separate multiple property/value pairs by commas. The connector
uses the properties as input parameters for the materialized view refresh
operation. The supported properties are different for each connector and
detailed in the SQL support section of the specific connector’s documentation.</p>
<p>After successful creation, all metadata about the materialized view is available
in a <a class="reference internal" href="../connector/system.html#system-metadata-materialized-views"><span class="std std-ref">system table</span></a>.</p>
</section>
<section id="examples">
<h2 id="examples">Examples<a class="headerlink" href="#examples" title="Permalink to this heading">#</a></h2>
<p>Create a simple materialized view <code class="docutils literal notranslate"><span class="pre">cancelled_orders</span></code> over the <code class="docutils literal notranslate"><span class="pre">orders</span></code> table
that only includes cancelled orders. Note that <code class="docutils literal notranslate"><span class="pre">orderstatus</span></code> is a numeric
value that is potentially meaningless to a consumer, yet the name of the view
clarifies the content:</p>
<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">CREATE</span> <span class="n">MATERIALIZED</span> <span class="k">VIEW</span> <span class="n">cancelled_orders</span>
<span class="k">AS</span>
    <span class="k">SELECT</span> <span class="n">orderkey</span><span class="p">,</span> <span class="n">totalprice</span>
    <span class="k">FROM</span> <span class="n">orders</span>
    <span class="k">WHERE</span> <span class="n">orderstatus</span> <span class="o">=</span> <span class="mi">3</span><span class="p">;</span>
</pre></div>
</div>
<p>Create or replace a materialized view <code class="docutils literal notranslate"><span class="pre">order_totals_by_date</span></code> that summarizes
<code class="docutils literal notranslate"><span class="pre">orders</span></code> across all orders from all customers:</p>
<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">CREATE</span> <span class="k">OR</span> <span class="k">REPLACE</span> <span class="n">MATERIALIZED</span> <span class="k">VIEW</span> <span class="n">order_totals_by_date</span>
<span class="k">AS</span>
    <span class="k">SELECT</span> <span class="n">orderdate</span><span class="p">,</span> <span class="k">sum</span><span class="p">(</span><span class="n">totalprice</span><span class="p">)</span> <span class="k">AS</span> <span class="n">price</span>
    <span class="k">FROM</span> <span class="n">orders</span>
    <span class="k">GROUP</span> <span class="k">BY</span> <span class="n">orderdate</span><span class="p">;</span>
</pre></div>
</div>
<p>Create a materialized view for a catalog using the Iceberg connector, with a
comment and partitioning on two fields in the storage:</p>
<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">CREATE</span> <span class="n">MATERIALIZED</span> <span class="k">VIEW</span> <span class="n">orders_nation_mkgsegment</span>
<span class="k">COMMENT</span> <span class="s1">'Orders with nation and market segment data'</span>
<span class="k">WITH</span> <span class="p">(</span> <span class="n">partitioning</span> <span class="o">=</span> <span class="nb">ARRAY</span><span class="p">[</span><span class="s1">'mktsegment'</span><span class="p">,</span> <span class="s1">'nationkey'</span><span class="p">]</span> <span class="p">)</span>
<span class="k">AS</span>
    <span class="k">SELECT</span> <span class="n">o</span><span class="p">.</span><span class="o">*</span><span class="p">,</span> <span class="k">c</span><span class="p">.</span><span class="n">nationkey</span><span class="p">,</span> <span class="k">c</span><span class="p">.</span><span class="n">mktsegment</span>
    <span class="k">FROM</span> <span class="n">orders</span> <span class="k">AS</span> <span class="n">o</span>
    <span class="k">JOIN</span> <span class="n">customer</span> <span class="k">AS</span> <span class="k">c</span>
    <span class="k">ON</span> <span class="n">o</span><span class="p">.</span><span class="n">custkey</span> <span class="o">=</span> <span class="k">c</span><span class="p">.</span><span class="n">custkey</span><span class="p">;</span>
</pre></div>
</div>
<p>Set multiple properties:</p>
<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">WITH</span> <span class="p">(</span> <span class="n">format</span> <span class="o">=</span> <span class="s1">'ORC'</span><span class="p">,</span> <span class="n">partitioning</span> <span class="o">=</span> <span class="nb">ARRAY</span><span class="p">[</span><span class="s1">'_date'</span><span class="p">]</span> <span class="p">)</span>
</pre></div>
</div>
<p>Show defined materialized view properties for all catalogs:</p>
<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">SELECT</span> <span class="o">*</span> <span class="k">FROM</span> <span class="k">system</span><span class="p">.</span><span class="n">metadata</span><span class="p">.</span><span class="n">materialized_view_properties</span><span class="p">;</span>
</pre></div>
</div>
<p>Show metadata about the materialized views in all catalogs:</p>
<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">SELECT</span> <span class="o">*</span> <span class="k">FROM</span> <span class="k">system</span><span class="p">.</span><span class="n">metadata</span><span class="p">.</span><span class="n">materialized_views</span><span class="p">;</span>
</pre></div>
</div>
</section>
<section id="see-also">
<h2 id="see-also">See also<a class="headerlink" href="#see-also" title="Permalink to this heading">#</a></h2>
<ul class="simple">
<li><p><a class="reference internal" href="drop-materialized-view.html"><span class="doc">DROP MATERIALIZED VIEW</span></a></p></li>
<li><p><a class="reference internal" href="show-create-materialized-view.html"><span class="doc">SHOW CREATE MATERIALIZED VIEW</span></a></p></li>
<li><p><a class="reference internal" href="refresh-materialized-view.html"><span class="doc">REFRESH MATERIALIZED VIEW</span></a></p></li>
</ul>
</section>
</section>


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