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<h1 id="sql-describe-input--page-root">DESCRIBE INPUT<a class="headerlink" href="#sql-describe-input--page-root" title="Permalink to this headline">#</a></h1>

<h2 id="synopsis">Synopsis<a class="headerlink" href="#synopsis" title="Permalink to this headline">#</a></h2>
<div class="highlight-text notranslate"><div class="highlight"><pre><span></span>DESCRIBE INPUT statement_name
</pre></div>
</div>


<h2 id="description">Description<a class="headerlink" href="#description" title="Permalink to this headline">#</a></h2>
<p>Lists the input parameters of a prepared statement along with the
position and type of each parameter. Parameter types that cannot be
determined will appear as <code class="docutils literal notranslate"><span class="pre">unknown</span></code>.</p>


<h2 id="examples">Examples<a class="headerlink" href="#examples" title="Permalink to this headline">#</a></h2>
<p>Prepare and describe a query with three parameters:</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="k">WHERE</span> <span class="n">regionkey</span> <span class="o">=</span> <span class="o">?</span> <span class="k">AND</span> <span class="n">name</span> <span class="o">&lt;</span> <span class="o">?</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">INPUT</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> Position | Type
--------------------
        0 | unknown
        1 | bigint
        2 | varchar
(3 rows)
</pre></div>
</div>
<p>Prepare and describe a query with no parameters:</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="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">INPUT</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> Position | Type
-----------------
(0 rows)
</pre></div>
</div>


<h2 id="see-also">See also<a class="headerlink" href="#see-also" title="Permalink to this headline">#</a></h2>
<p><a class="reference internal" href="prepare.html"><span class="doc">PREPARE</span></a></p>


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