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<h1 class="title">CREATE VIEW</h1>
<h3 id="description">Description</h3>
<p>Views are based on the result-set of an <code class="highlighter-rouge">SQL</code> query. <code class="highlighter-rouge">CREATE VIEW</code> constructs
a virtual table that has no physical data therefore other operations like
<code class="highlighter-rouge">ALTER VIEW</code> and <code class="highlighter-rouge">DROP VIEW</code> only change metadata.</p>
<h3 id="syntax">Syntax</h3>
<figure class="highlight"><pre><code class="language-sql" data-lang="sql"><span class="k">CREATE</span> <span class="p">[</span> <span class="k">OR</span> <span class="k">REPLACE</span> <span class="p">]</span> <span class="p">[</span> <span class="p">[</span> <span class="k">GLOBAL</span> <span class="p">]</span> <span class="k">TEMPORARY</span> <span class="p">]</span> <span class="k">VIEW</span> <span class="p">[</span> <span class="n">IF</span> <span class="k">NOT</span> <span class="k">EXISTS</span> <span class="p">]</span> <span class="n">view_identifier</span>
<span class="n">create_view_clauses</span> <span class="k">AS</span> <span class="n">query</span></code></pre></figure>
<h3 id="parameters">Parameters</h3>
<dl>
<dt><code><em>OR REPLACE</em></code></dt>
<dd>If a view of same name already exists, it will be replaced.</dd>
</dl>
<dl>
<dt><code><em>[ GLOBAL ] TEMPORARY</em></code></dt>
<dd>TEMPORARY views are session-scoped and will be dropped when session ends
because it skips persisting the definition in the underlying metastore, if any.
GLOBAL TEMPORARY views are tied to a system preserved temporary database `global_temp`.</dd>
</dl>
<dl>
<dt><code><em>IF NOT EXISTS</em></code></dt>
<dd>Creates a view if it does not exists.</dd>
</dl>
<dl>
<dt><code><em>view_identifier</em></code></dt>
<dd>
Specifies a view name, which may be optionally qualified with a database name.<br /><br />
<b> Syntax:</b>
<code>
[ database_name. ] view_name
</code>
</dd>
</dl>
<dl>
<dt><code><em>create_view_clauses</em></code></dt>
<dd>These clauses are optional and order insensitive. It can be of following formats.
<ul>
<li><code>[ ( column_name [ COMMENT column_comment ], ... ) ]</code> to specify column-level comments.</li>
<li><code>[ COMMENT view_comment ]</code> to specify view-level comments.</li>
<li><code>[ TBLPROPERTIES ( property_name = property_value, ... ) ]</code> to add metadata key-value pairs.</li>
</ul>
</dd>
</dl>
<dl>
<dt><code><em>query</em></code></dt>
<dd>A <a href="sql-ref-syntax-qry-select.html">SELECT</a> statement that constructs the view from base tables or other views.</dd>
</dl>
<h3 id="examples">Examples</h3>
<figure class="highlight"><pre><code class="language-sql" data-lang="sql"><span class="c1">-- Create or replace view for `experienced_employee` with comments.</span>
<span class="k">CREATE</span> <span class="k">OR</span> <span class="k">REPLACE</span> <span class="k">VIEW</span> <span class="n">experienced_employee</span>
<span class="p">(</span><span class="n">ID</span> <span class="k">COMMENT</span> <span class="s1">'Unique identification number'</span><span class="p">,</span> <span class="n">Name</span><span class="p">)</span>
<span class="k">COMMENT</span> <span class="s1">'View for experienced employees'</span>
<span class="k">AS</span> <span class="k">SELECT</span> <span class="n">id</span><span class="p">,</span> <span class="n">name</span> <span class="k">FROM</span> <span class="n">all_employee</span>
<span class="k">WHERE</span> <span class="n">working_years</span> <span class="o">&gt;</span> <span class="mi">5</span><span class="p">;</span>
<span class="c1">-- Create a global temporary view `subscribed_movies` if it does not exist.</span>
<span class="k">CREATE</span> <span class="k">GLOBAL</span> <span class="k">TEMPORARY</span> <span class="k">VIEW</span> <span class="n">IF</span> <span class="k">NOT</span> <span class="k">EXISTS</span> <span class="n">subscribed_movies</span>
<span class="k">AS</span> <span class="k">SELECT</span> <span class="n">mo</span><span class="p">.</span><span class="n">member_id</span><span class="p">,</span> <span class="n">mb</span><span class="p">.</span><span class="n">full_name</span><span class="p">,</span> <span class="n">mo</span><span class="p">.</span><span class="n">movie_title</span>
<span class="k">FROM</span> <span class="n">movies</span> <span class="k">AS</span> <span class="n">mo</span> <span class="k">INNER</span> <span class="k">JOIN</span> <span class="n">members</span> <span class="k">AS</span> <span class="n">mb</span>
<span class="k">ON</span> <span class="n">mo</span><span class="p">.</span><span class="n">member_id</span> <span class="o">=</span> <span class="n">mb</span><span class="p">.</span><span class="n">id</span><span class="p">;</span></code></pre></figure>
<h3 id="related-statements">Related Statements</h3>
<ul>
<li><a href="sql-ref-syntax-ddl-alter-view.html">ALTER VIEW</a></li>
<li><a href="sql-ref-syntax-ddl-drop-view.html">DROP VIEW</a></li>
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