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<!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>8.22. PREPARE — Presto 0.186 Documentation</title>
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URL_ROOT: '../',
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HAS_SOURCE: true
};
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<body role="document">
<div class="header">
<h1 class="heading"><a href="../index.html">
<span>Presto 0.186 Documentation</span></a></h1>
<h2 class="heading"><span>8.22. PREPARE</span></h2>
</div>
<div class="topnav">
<p class="nav">
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« <a href="insert.html">8.21. INSERT</a>
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</div>
<div class="content">
<div class="section" id="prepare">
<h1>8.22. PREPARE</h1>
<div class="section" id="synopsis">
<h2>Synopsis</h2>
<div class="highlight-none"><div class="highlight"><pre><span></span>PREPARE statement_name FROM statement
</pre></div>
</div>
</div>
<div class="section" id="description">
<h2>Description</h2>
<p>Prepares a statement for execution at a later time. Prepared statements are
queries that are saved in a session with a given name. The statement can
include parameters in place of literals to be replaced at execution time.
Parameters are represented by question marks.</p>
</div>
<div class="section" id="examples">
<h2>Examples</h2>
<p>Prepare a select query:</p>
<div class="highlight-sql"><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>
<p>Prepare a select query that includes parameters. The values to compare with
<code class="docutils literal"><span class="pre">regionkey</span></code> and <code class="docutils literal"><span class="pre">nationkey</span></code> will be filled in with the <a class="reference internal" href="execute.html"><span class="doc">EXECUTE</span></a> statement:</p>
<div class="highlight-sql"><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="n">name</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">nationkey</span> <span class="o"><</span> <span class="o">?</span><span class="p">;</span>
</pre></div>
</div>
<p>Prepare an insert query:</p>
<div class="highlight-sql"><div class="highlight"><pre><span></span><span class="k">PREPARE</span> <span class="n">my_insert</span> <span class="k">FROM</span>
<span class="k">INSERT</span> <span class="k">INTO</span> <span class="n">cities</span> <span class="k">VALUES</span> <span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="s1">'San Francisco'</span><span class="p">);</span>
</pre></div>
</div>
</div>
<div class="section" id="see-also">
<h2>See Also</h2>
<p><a class="reference internal" href="execute.html"><span class="doc">EXECUTE</span></a>, <a class="reference internal" href="deallocate-prepare.html"><span class="doc">DEALLOCATE PREPARE</span></a>, <a class="reference internal" href="describe-input.html"><span class="doc">DESCRIBE INPUT</span></a>, <a class="reference internal" href="describe-output.html"><span class="doc">DESCRIBE OUTPUT</span></a></p>
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