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  <section id="describe-output">
<h1 id="sql-describe-output--page-root">DESCRIBE OUTPUT<a class="headerlink" href="#sql-describe-output--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>DESCRIBE OUTPUT statement_name
</pre></div>
</div>
</section>
<section id="description">
<h2 id="description">Description<a class="headerlink" href="#description" title="Permalink to this heading">#</a></h2>
<p>List the output columns of a prepared statement, including the
column name (or alias), catalog, schema, table, type, type size in
bytes, and a boolean indicating if the column is aliased.</p>
</section>
<section id="examples">
<h2 id="examples">Examples<a class="headerlink" href="#examples" title="Permalink to this heading">#</a></h2>
<p>Prepare and describe a query with four output columns:</p>
<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">PREPARE</span> <span class="n">my_select1</span> <span class="k">FROM</span>
<span class="k">SELECT</span> <span class="o">*</span> <span class="k">FROM</span> <span class="n">nation</span><span class="p">;</span>
</pre></div>
</div>
<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">DESCRIBE</span> <span class="k">OUTPUT</span> <span class="n">my_select1</span><span class="p">;</span>
</pre></div>
</div>
<div class="highlight-text notranslate"><div class="highlight"><pre><span></span> Column Name | Catalog | Schema | Table  |  Type   | Type Size | Aliased
-------------+---------+--------+--------+---------+-----------+---------
 nationkey   | tpch    | sf1    | nation | bigint  |         8 | false
 name        | tpch    | sf1    | nation | varchar |         0 | false
 regionkey   | tpch    | sf1    | nation | bigint  |         8 | false
 comment     | tpch    | sf1    | nation | varchar |         0 | false
(4 rows)
</pre></div>
</div>
<p>Prepare and describe a query whose output columns are expressions:</p>
<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">PREPARE</span> <span class="n">my_select2</span> <span class="k">FROM</span>
<span class="k">SELECT</span> <span class="k">count</span><span class="p">(</span><span class="o">*</span><span class="p">)</span> <span class="k">as</span> <span class="n">my_count</span><span class="p">,</span> <span class="mi">1</span><span class="o">+</span><span class="mi">2</span> <span class="k">FROM</span> <span class="n">nation</span><span class="p">;</span>
</pre></div>
</div>
<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">DESCRIBE</span> <span class="k">OUTPUT</span> <span class="n">my_select2</span><span class="p">;</span>
</pre></div>
</div>
<div class="highlight-text notranslate"><div class="highlight"><pre><span></span> Column Name | Catalog | Schema | Table |  Type  | Type Size | Aliased
-------------+---------+--------+-------+--------+-----------+---------
 my_count    |         |        |       | bigint |         8 | true
 _col1       |         |        |       | bigint |         8 | false
(2 rows)
</pre></div>
</div>
<p>Prepare and describe a row count query:</p>
<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">PREPARE</span> <span class="n">my_create</span> <span class="k">FROM</span>
<span class="k">CREATE</span> <span class="k">TABLE</span> <span class="n">foo</span> <span class="k">AS</span> <span class="k">SELECT</span> <span class="o">*</span> <span class="k">FROM</span> <span class="n">nation</span><span class="p">;</span>
</pre></div>
</div>
<div class="highlight-sql notranslate"><div class="highlight"><pre><span></span><span class="k">DESCRIBE</span> <span class="k">OUTPUT</span> <span class="n">my_create</span><span class="p">;</span>
</pre></div>
</div>
<div class="highlight-text notranslate"><div class="highlight"><pre><span></span> Column Name | Catalog | Schema | Table |  Type  | Type Size | Aliased
-------------+---------+--------+-------+--------+-----------+---------
 rows        |         |        |       | bigint |         8 | false
(1 row)
</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>
<p><a class="reference internal" href="prepare.html"><span class="doc">PREPARE</span></a></p>
</section>
</section>


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